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The different ‘places’ where one discusses or presents work, and the particular quality of the environment where these take place. These spatial metaphors range in character from being in-progress, pedagogical or informal to communicative, informational or archival.
The variety of media and formats in which research outputs can take shape, engaging different forms of communication, reaching particular audiences and accomplishing specific purposes.
The different ways in which one person ‘knows more than she can tell’ depending on the character and origin of the knowledge. These different forms of tacit knowing describe its specificity: pointing out whether something is implicit because it is unconscious, unrecognized, unsaid, uncodified etc.
The keywords, fields and concepts that situate the particular contributions of the network within broader literature and schools of thought.
The different phases and forms of dissemination that research and academic outputs can take, indicating the kind of publication, the progress of the work or the forum where they are presented.
The idioms that reflect the multinational character and vocalize the conversations of the TACK network and its outputs.
The members, contributors, facilitators, communities and organizations that build up, around and underneath the TACK Network and participate, in one way or another, in the endeavour of addressing the question of Tacit Knowledge in architecture.
TACK Exhibition Object

Tesseln/Bâton à marques

Bâtons à marques (also called ratement,s Tesseln) are  pieces of carved carved wood used as tally sticks in the Swiss Alps. They functioned as  as records of use rights, productstaxes, products, and labour duties in relation to common resources. Tesseln in Upper-Valais and and bâton à marques in LowerBas-Valais were employed in the governance of common property and resourcesvarious forms of common property, including alpine pastures, wine, and irrigation water.
Nicole de Lalouviere
TACK Exhibition Object

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Tesseln/Bâton à marques

Nicole de Lalouviere
© TACK
Bâtons à marques (also called ratement,s Tesseln) are  pieces of carved carved wood used as tally sticks in the Swiss Alps. They functioned as  as records of use rights, productstaxes, products, and labour duties in relation to common resources. Tesseln in Upper-Valais and and bâton à marques in LowerBas-Valais were employed in the governance of common property and resourcesvarious forms of common property, including alpine pastures, wine, and irrigation water.
Book chapter TACK Book

No Body, Never Mind: The entanglement of how architects construct imagination

Figure 3.1: My Mother’s back, 1996, Elinor Carucci Source: Elinor Carucci’s private archive. US Credit: Elinor Carucci., © US Credit: Elinor Carucci
ABSTRACT
In architectural practice, one does not primarily write, one draws, models or explains with words, mostly through the visual communication of ideas. Just as architects use literacy to describe stories and connect with what touches them, material literacy is necessary to describe what architects literally touch. Material has the ability to respond to the design and even influence it at a very early stage of the process when it comes into contact with the body. As the scientist Barad rightly asked: “How did language come to be more trustworthy than matter?” (Barad, 2003). Material can create an experimental platform to trigger emotions, to go beyond norms and return to what has become schematic in the process of making architecture. This method of architectural dramaturgy, i.e., seeking a multifaceted narrative about house and home through engagement with material, could critically reveal unseen labour and unheard voices, and facilitate a connection to our surrounding.   The paper argues feelings from the inside of the body that apparent on the outside of the body offer new ways of knowledge production in architecture. Adopting the interdisciplinary approach by Finish architect and critic Juhani Pallasmaa (in his The Thinking Hand, 2009) the paper considers theatre and performance studies as examples of phenomenological aspects of kinaesthetic and multi-sensory perception of “the internal space and one’s inner mental space” (Pallasmaa, 2009, p.19). By theoretically analysing related emotions embedded in the various hands-on processes mediated through visuals (image, video, drawings) and the applicability of the materiality of the human body (voice, gesture, etc.), empathy and trust in both architectural and theatrical production are an important trajectory to enrich collective knowledge. Starting from here, the chapter advocates not only looking at visual mediation of material, but going beyond that and prompting the capability to read and listen to sound, expression and movement that come from both sides equally – humans and non-humans – to build up material literacy and achieve a sensitivity towards tacit knowledge in architecture.
Mara Trübenbach
Book chapter TACK Book

November 1, 2022

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No Body, Never Mind: The entanglement of how architects construct imagination

Mara Trübenbach
Figure 3.1: My Mother’s back, 1996, Elinor Carucci Source: Elinor Carucci’s private archive. US Credit: Elinor Carucci., © US Credit: Elinor Carucci
ABSTRACT
In architectural practice, one does not primarily write, one draws, models or explains with words, mostly through the visual communication of ideas. Just as architects use literacy to describe stories and connect with what touches them, material literacy is necessary to describe what architects literally touch. Material has the ability to respond to the design and even influence it at a very early stage of the process when it comes into contact with the body. As the scientist Barad rightly asked: “How did language come to be more trustworthy than matter?” (Barad, 2003). Material can create an experimental platform to trigger emotions, to go beyond norms and return to what has become schematic in the process of making architecture. This method of architectural dramaturgy, i.e., seeking a multifaceted narrative about house and home through engagement with material, could critically reveal unseen labour and unheard voices, and facilitate a connection to our surrounding.   The paper argues feelings from the inside of the body that apparent on the outside of the body offer new ways of knowledge production in architecture. Adopting the interdisciplinary approach by Finish architect and critic Juhani Pallasmaa (in his The Thinking Hand, 2009) the paper considers theatre and performance studies as examples of phenomenological aspects of kinaesthetic and multi-sensory perception of “the internal space and one’s inner mental space” (Pallasmaa, 2009, p.19). By theoretically analysing related emotions embedded in the various hands-on processes mediated through visuals (image, video, drawings) and the applicability of the materiality of the human body (voice, gesture, etc.), empathy and trust in both architectural and theatrical production are an important trajectory to enrich collective knowledge. Starting from here, the chapter advocates not only looking at visual mediation of material, but going beyond that and prompting the capability to read and listen to sound, expression and movement that come from both sides equally – humans and non-humans – to build up material literacy and achieve a sensitivity towards tacit knowledge in architecture.
Paper Session NATURE(S) TACK Conference Proceedings

Improvised architectural responses to the changing climate – Making, sharing and communicating design processes in rural Bangladesh

ABSTRACT
Bangladesh is particularly vulnerable to global climate change because of the shifting riparian characteristics of its landscape and location, with weather-driven calamities disproportionately affecting low-income rural communities. Research findings highlight the unequal distribution of responsibilities and the greater burden on women in the community to respond to the threats of extreme climate. The research methodology for this PhD by Architectural Practice therefore seeks to empower those in Bangladeshi villages by enabling marginalised voices to be heard through an emphasis on collective engagement, especially incorporating the contributions by female residents. Carried out through community-oriented projects in the remote village of Rajapur, this ‘live’ practice-based thesis explores, tests, shares and disseminates some of the rich and varied forms of tacit knowledge which can provide valuable understandings both for those people in the locality and also for architects and designers on the international scale. Responding to social and ecological ‘entanglements’ in Rajapur, the specific problems addressed are erratic rainfall patterns which create both droughts and floods, rising sea levels caused by climate change, and naturally occurring extremely high levels of arsenic-contaminated groundwater supplies, poisoning the food chain and fish in nearby ponds and lakes. How to devise affordable, low-tech solutions that utilise the tacit knowledge and skills of those living in remote villages such as Rajapur? To reshape architectural practice as an active agent for decolonising design methods, so that issues of climate change and spatial justice can be better dealt with, the research draws upon applied anthropological methods – ‘ethnography in the field’ – which prioritise local community members as the indigenous producers of design research, analytical drawings, making and storytelling. The thesis thus addresses a gap in knowledge by contributing a unique approach to participatory architectural practice, showing how it can be expanded to include rural communities in the Global South.
Tumpa Husna Yasmin Fellows
Paper Session NATURE(S) TACK Conference Proceedings

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Improvised architectural responses to the changing climate – Making, sharing and communicating design processes in rural Bangladesh

Tumpa Husna Yasmin Fellows
ABSTRACT
Bangladesh is particularly vulnerable to global climate change because of the shifting riparian characteristics of its landscape and location, with weather-driven calamities disproportionately affecting low-income rural communities. Research findings highlight the unequal distribution of responsibilities and the greater burden on women in the community to respond to the threats of extreme climate. The research methodology for this PhD by Architectural Practice therefore seeks to empower those in Bangladeshi villages by enabling marginalised voices to be heard through an emphasis on collective engagement, especially incorporating the contributions by female residents. Carried out through community-oriented projects in the remote village of Rajapur, this ‘live’ practice-based thesis explores, tests, shares and disseminates some of the rich and varied forms of tacit knowledge which can provide valuable understandings both for those people in the locality and also for architects and designers on the international scale. Responding to social and ecological ‘entanglements’ in Rajapur, the specific problems addressed are erratic rainfall patterns which create both droughts and floods, rising sea levels caused by climate change, and naturally occurring extremely high levels of arsenic-contaminated groundwater supplies, poisoning the food chain and fish in nearby ponds and lakes. How to devise affordable, low-tech solutions that utilise the tacit knowledge and skills of those living in remote villages such as Rajapur? To reshape architectural practice as an active agent for decolonising design methods, so that issues of climate change and spatial justice can be better dealt with, the research draws upon applied anthropological methods – ‘ethnography in the field’ – which prioritise local community members as the indigenous producers of design research, analytical drawings, making and storytelling. The thesis thus addresses a gap in knowledge by contributing a unique approach to participatory architectural practice, showing how it can be expanded to include rural communities in the Global South.
Exhibition Model TACK Exhibition Object

Chozos, Houses of Nomadic Shepherds

Chozos in Cabeza del Buey. On the left the traditional chozo, on the right the demountable chozo that has toured to Germany and now Switzerland. Photo: Marie Kuch
The chozos are traditional huts that up until about 50 years ago were built by shepherds in rural Spain as they moved around the fields with their sheep. This chozo was constructed in September 2022 by sixteen students from the University of Stuttgart during an intense exchange with experts in southern Spain.
Alba Balmaseda Dominguez Kyra Bullert Špela Setzen Markus Vogl
Exhibition Model TACK Exhibition Object

October 5, 2022

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Chozos, Houses of Nomadic Shepherds

Alba Balmaseda Dominguez Kyra Bullert Špela Setzen Markus Vogl
Chozos in Cabeza del Buey. On the left the traditional chozo, on the right the demountable chozo that has toured to Germany and now Switzerland. Photo: Marie Kuch
© TACK
The chozos are traditional huts that up until about 50 years ago were built by shepherds in rural Spain as they moved around the fields with their sheep. This chozo was constructed in September 2022 by sixteen students from the University of Stuttgart during an intense exchange with experts in southern Spain.
Exhibition Model TACK Exhibition Object

Anthropomorphe Form

Anthropomorphe Form, an installation produced by an interdisciplinary team led by Edelaar Mosayebi Inderbitzin Architekten and Fabian Bircher explores the potentials of an architectural space that moves and interacts with people.
Elli Mosayebi
Exhibition Model TACK Exhibition Object

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Anthropomorphe Form

Elli Mosayebi
© TACK
Anthropomorphe Form, an installation produced by an interdisciplinary team led by Edelaar Mosayebi Inderbitzin Architekten and Fabian Bircher explores the potentials of an architectural space that moves and interacts with people.
Exhibition Model TACK Exhibition Object

Glassplitter / Broken glass

Near the end of the previous century, waste recycling became more common in Switzerland – not only for paper, but also metal and glass. While developing the plans for the Kirchner Museum Davos in 1989, we had the idea to use waste glass as roof covering for the glazed building, instead of gravel or sheet metal. Glass has a similar weight to gravel and is therefore well suited for ballasting flat roofs. Without much effort, the cullet could be taken from the recycling process before remelting.
Annette Gigon Mike Guyer
Exhibition Model TACK Exhibition Object

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Glassplitter / Broken glass

Annette Gigon Mike Guyer
© TACK
Near the end of the previous century, waste recycling became more common in Switzerland – not only for paper, but also metal and glass. While developing the plans for the Kirchner Museum Davos in 1989, we had the idea to use waste glass as roof covering for the glazed building, instead of gravel or sheet metal. Glass has a similar weight to gravel and is therefore well suited for ballasting flat roofs. Without much effort, the cullet could be taken from the recycling process before remelting.
Online Teaching Module

Unveiling Embodied Tacit Knowledge through the Act of Drawing

© Paula Strunden
Paula Strunden Angelika Schnell Eva Sommeregger Academy of Fine Arts Vienna, Institute for Art and Architecture
Online Teaching Module

February 20, 2023

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Unveiling Embodied Tacit Knowledge through the Act of Drawing

Paula Strunden Angelika Schnell Eva Sommeregger Academy of Fine Arts Vienna, Institute for Art and Architecture
© Paula Strunden
© Paula Strunden
© Paula Strunden
© Paula Strunden
© Paula Strunden
© Paula Strunden
Online Teaching Module

Bridging architectural knowledge and lived experience through apprenticeship

© Ionas Sklavounos
Ionas Sklavounos Lara Schrijver University of Antwerp, Faculty of Design Sciences, Department of Architecture
Online Teaching Module

March 23, 2023

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Bridging architectural knowledge and lived experience through apprenticeship

Ionas Sklavounos Lara Schrijver University of Antwerp, Faculty of Design Sciences, Department of Architecture
© Ionas Sklavounos
© Ionas Sklavounos
© Ionas Sklavounos
© Ionas Sklavounos
© Ionas Sklavounos
Conference Paper Paper

POSTHUMANIST SANDBOX: THE POTENTIAL OF MULTIPLAYER – ENVIRONMENTS

ABSTRACT
This paper seeks to reveal a novel assessment of creative production in academic education, re-evaluating the conceptual and artistic potential of virtual real-time collaboration through digital media. Allowing for transcultural exchange as well as global participation, this could positively influence the development of novel artistic approaches and innovative measures for universities by contributing to a more contemporary, location-independent, and ultimately more equal form of art and knowledge production.
Valerie Messini Eva Sommeregger
Conference Paper Paper

November 4, 2021

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POSTHUMANIST SANDBOX: THE POTENTIAL OF MULTIPLAYER – ENVIRONMENTS

Valerie Messini Eva Sommeregger
© Eva Sommeregger
ABSTRACT
This paper seeks to reveal a novel assessment of creative production in academic education, re-evaluating the conceptual and artistic potential of virtual real-time collaboration through digital media. Allowing for transcultural exchange as well as global participation, this could positively influence the development of novel artistic approaches and innovative measures for universities by contributing to a more contemporary, location-independent, and ultimately more equal form of art and knowledge production.
Exhibition Model TACK Exhibition Object

20-11-2021

HERMIA

© Mara Trübenbach
"Through the material, I built a relationship with the (hi)story of the ship and acquired knowledge that is tacitly held between the humans and the non-humans."
Mara Trübenbach
Exhibition Model TACK Exhibition Object

20-11-2021

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HERMIA

Mara Trübenbach
© Mara Trübenbach
© TACK
"Through the material, I built a relationship with the (hi)story of the ship and acquired knowledge that is tacitly held between the humans and the non-humans."
Essay

Return from the Future: The Concept of Retroactivity

OMA (1975), triptych, Boompjes Tower Slab, 1982. Colour silkscreen print, 716 × 1216 mm. Silkscreener: Bernard Ruygrok. Source: Drawing Matter
Koolhaas called his 1978 book Delirious New York a ‘retroactive manifesto for Manhattan’. In her essay Angelika Schnell describes how the concept of retroactivity is used in the architecture of OMA. Especially the high-rise project for Boompjes in Rotterdam, made between 1979 and 1981, is a design that ‘has become effective at a time in the past’. A careful reading of the accompanying text, but also the features of the design itself, reveal the circular logic of the hermeneutical model used by Koolhaas: designs are the stories that provoked the causes in the past.
Angelika Schnell
Essay

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Return from the Future: The Concept of Retroactivity

Angelika Schnell
OMA (1975), triptych, Boompjes Tower Slab, 1982. Colour silkscreen print, 716 × 1216 mm. Silkscreener: Bernard Ruygrok. Source: Drawing Matter
Koolhaas called his 1978 book Delirious New York a ‘retroactive manifesto for Manhattan’. In her essay Angelika Schnell describes how the concept of retroactivity is used in the architecture of OMA. Especially the high-rise project for Boompjes in Rotterdam, made between 1979 and 1981, is a design that ‘has become effective at a time in the past’. A careful reading of the accompanying text, but also the features of the design itself, reveal the circular logic of the hermeneutical model used by Koolhaas: designs are the stories that provoked the causes in the past.
Paper Session VECTORS TACK Conference Proceedings

(Un)Programming the Factory: Weaving Panopticon Stories

ABSTRACT
This paper departs from practice-based research developed in Coelima, a Portuguese textile factory under socio-spatial dismantlement, to investigate the relationships between its assembly line, stories, and weaving. I ask how sets of tacit knowledge developed through workers' stories and temporal hand-weaving practices can provide new directions for architectural design to reimagine alternative 'poethical' (Retallack, 2003) working modes in the assembly line. To do so, I build upon workers' stories, which refer to acts of surveillance experienced in the weaving department under capital efficiency (Giedion, 1948), to investigate the tacit process of patterning stories through weaving (Kruger, 2001; Albers, 1959). Words taken from the workers' stories are designed as weave draft notations, or 'panopticon patterns', through a collaborative event with a group of former workers of Coelima to generate a site-specific textile language and knowledge. Although this knowledge can only be transmitted via experience, repetition, and performative making (Nimkulrat, 2012), I suggest that it can evoke emancipatory possibilities for workers and architects to reimagine socially and spatially other configurations for the assembly line grounded in ideas of industrial commons (Rappaport, 2021). Finally, I argue that knowledge acquired from weaving, weave draft notations and stories can provide creative means for architectural design to (un)program work control and time in Coelima's assembly line while re-evaluating issues of (post)work, pleasure, and productivity within the contemporary workplace.
Fernando Ferreira
Paper Session VECTORS TACK Conference Proceedings

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(Un)Programming the Factory: Weaving Panopticon Stories

Fernando Ferreira
ABSTRACT
This paper departs from practice-based research developed in Coelima, a Portuguese textile factory under socio-spatial dismantlement, to investigate the relationships between its assembly line, stories, and weaving. I ask how sets of tacit knowledge developed through workers' stories and temporal hand-weaving practices can provide new directions for architectural design to reimagine alternative 'poethical' (Retallack, 2003) working modes in the assembly line. To do so, I build upon workers' stories, which refer to acts of surveillance experienced in the weaving department under capital efficiency (Giedion, 1948), to investigate the tacit process of patterning stories through weaving (Kruger, 2001; Albers, 1959). Words taken from the workers' stories are designed as weave draft notations, or 'panopticon patterns', through a collaborative event with a group of former workers of Coelima to generate a site-specific textile language and knowledge. Although this knowledge can only be transmitted via experience, repetition, and performative making (Nimkulrat, 2012), I suggest that it can evoke emancipatory possibilities for workers and architects to reimagine socially and spatially other configurations for the assembly line grounded in ideas of industrial commons (Rappaport, 2021). Finally, I argue that knowledge acquired from weaving, weave draft notations and stories can provide creative means for architectural design to (un)program work control and time in Coelima's assembly line while re-evaluating issues of (post)work, pleasure, and productivity within the contemporary workplace.
Book chapter TACK Book

Latent Continuities: Architectural knowledge and the heuristic tension of Indwelling

ABSTRACT
In his theory of Tacit Knowledge Michael Polanyi introduced the concept of Indwelling, to explain the role of habit and skill in practice-based knowledge, but also to describe a heuristic tension that underlies all forms of knowing. Such a tension, Polanyi tells us, unfolds from the ‘depths’ of our biological being to the ‘heights’ of ideas and cultural values. The premise of this essay is that the spatial (and temporal) metaphor of Indwelling is hardly an accident: human consciousness is opened to knowledge primarily through our physical engagement with the world, marked by both space and time. The hypothesis is thus formed of architecture as a discipline studying precisely such tacit processes of (In)dwelling, in search of correspondences between ‘thick’ levels of bodily disposition and ‘thinner’ levels of intellect and imagination. To pursue this hypothesis, I turn to the example of a two-month apprenticeship in traditional stonemasonry, that took place in 2019 in Greece, entailing the reconstruction of a particular type of dry-stone cobbled pathway, called kalderimi.
Ionas Sklavounos
Book chapter TACK Book

November 1, 2022

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Latent Continuities: Architectural knowledge and the heuristic tension of Indwelling

Ionas Sklavounos
ABSTRACT
In his theory of Tacit Knowledge Michael Polanyi introduced the concept of Indwelling, to explain the role of habit and skill in practice-based knowledge, but also to describe a heuristic tension that underlies all forms of knowing. Such a tension, Polanyi tells us, unfolds from the ‘depths’ of our biological being to the ‘heights’ of ideas and cultural values. The premise of this essay is that the spatial (and temporal) metaphor of Indwelling is hardly an accident: human consciousness is opened to knowledge primarily through our physical engagement with the world, marked by both space and time. The hypothesis is thus formed of architecture as a discipline studying precisely such tacit processes of (In)dwelling, in search of correspondences between ‘thick’ levels of bodily disposition and ‘thinner’ levels of intellect and imagination. To pursue this hypothesis, I turn to the example of a two-month apprenticeship in traditional stonemasonry, that took place in 2019 in Greece, entailing the reconstruction of a particular type of dry-stone cobbled pathway, called kalderimi.
Image Newsletter Reflection

A Map of Movements

Gennaro Postiglione initiated the idea of a “TACK Map”, visualizing the research movements of the TACK PhD Students and shares with here his thoughts on the produced map.
Gennaro Postiglione
Image Newsletter Reflection

May 20, 2022

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A Map of Movements

Gennaro Postiglione
Gennaro Postiglione initiated the idea of a “TACK Map”, visualizing the research movements of the TACK PhD Students and shares with here his thoughts on the produced map.
Paper Session VECTORS TACK Conference Proceedings

Rooms: Architectural Model-Making as Ethnographic Research

Fig. 1
ABSTRACT
Within design and architecture, scale models can create worlds of proposition, speculation and fiction. This paper situates the model as a tool for observation, documentation and engagement; a slow, durational method that manifests a deep participation in the lives of place and people marginalised by wider society. Rooms was an artistic and research project undertaken as part of the Urban Nation artistic residency in Berlin which looked at the Romanian immigrant community inhabiting the city, the spaces they occupy and appropriate, and the objects that they surround themselves with. These instances were drawn, surveyed, documented and then recreated through 1:20 paper models. Built to an extreme level of detail the models of everyday space visualise, offer new insight, and give a sense of value and recognition to the lived realities of individuals. A situated mode of research, this form of representation transforms the seemingly mundane into an object of beauty and atmosphere, encouraging access and participation from the participant, maker and the viewer. The inherently collaborative aspect of this process reveals the tacit, implicit knowledge present in everyday actions.
Ecaterina Stefanescu
Paper Session VECTORS TACK Conference Proceedings

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Rooms: Architectural Model-Making as Ethnographic Research

Ecaterina Stefanescu
Fig. 1
Fig. 2
ABSTRACT
Within design and architecture, scale models can create worlds of proposition, speculation and fiction. This paper situates the model as a tool for observation, documentation and engagement; a slow, durational method that manifests a deep participation in the lives of place and people marginalised by wider society. Rooms was an artistic and research project undertaken as part of the Urban Nation artistic residency in Berlin which looked at the Romanian immigrant community inhabiting the city, the spaces they occupy and appropriate, and the objects that they surround themselves with. These instances were drawn, surveyed, documented and then recreated through 1:20 paper models. Built to an extreme level of detail the models of everyday space visualise, offer new insight, and give a sense of value and recognition to the lived realities of individuals. A situated mode of research, this form of representation transforms the seemingly mundane into an object of beauty and atmosphere, encouraging access and participation from the participant, maker and the viewer. The inherently collaborative aspect of this process reveals the tacit, implicit knowledge present in everyday actions.
Video

Toolkit for Today

As part of the 2017 Toolkit seminar, Janina Gosseye and Naomi Stead raise questions and discuss cases from their own work gathering oral histories, including for a project on female architects in Australia. They are joined by, Thomas-Bernard Kenniff, who discusses interviews he conducted with those affected by the development of Montreal’s Place des Festivals.
Janina Gosseye Naomi Stead
Video

August 17, 2017

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Toolkit for Today

Janina Gosseye Naomi Stead
As part of the 2017 Toolkit seminar, Janina Gosseye and Naomi Stead raise questions and discuss cases from their own work gathering oral histories, including for a project on female architects in Australia. They are joined by, Thomas-Bernard Kenniff, who discusses interviews he conducted with those affected by the development of Montreal’s Place des Festivals.
Book chapter TACK Book

Hunting Tacit Knowledge: Encounters in architectural education at ILAUD and ETH

ABSTRACT
Tacit knowledge in architectural education is slippery. It encompasses a broad range of unconscious, embodied, social and otherwise hidden forms of knowing. On one hand, this means that it manifests in different ways depending on the pedagogical format or context. On the other, it resists explanation through the traditional, and largely explicit, tools of academic writing. Therefore, rather than seeking to define it, this paper proposes three approaches for locating and describing it. First, forms of tacit knowing—which we rely on, often without thinking, in our studio, school, or regional culture—become more visible in “moments of encounter” between communities. Second, discussions and negotiations of tacit knowledge often occur through architectural materials: drawings, models, texts, buildings. Third, “moments of tacit encounter” require more evocative and speculative methods of writing and representation, with different evidentiary standards. To test these approaches, this paper narrates two “moments of encounter” as case studies, encompassing different pedagogical formats, actors, writing methods, and revealing different forms of tacit knowledge.   In 2020, I arrived at ETH Zurich, where I began an autoethnographic study of tacit knowledge in discussions between critics across design studios. I was drawn to the realistic models of Studio Caruso, which I first encountered in my architectural studies in Australia. There, they represented a hitherto unimaginable departure from model abstraction. In Zurich, though, some critics were less dazzled, questioning the labor they required. Elsewhere, realistic models had been at the center of right-wing outrage over a kiosk designed by Caruso’s office in Escher-Wyss Platz in 2007. Around these models, the tacit architectural expectations of various groups seemed to reveal itself.   In 2021, I organized a summer school in Rotterdam on summer schools. Over five days, we re-enacted a charette exercise originally set for the 1986 edition of the International Laboratory of Architecture and Urban Design (ILAUD): the summer workshops founded by Giancarlo de Carlo in Urbino. Summer schools are ephemeral in nature—intense, productive, social, life-changing, but only for a few weeks—leaving little evidence of their tacit dimension for us to study today. Re-enacting it ourselves, coming from different educational backgrounds, we started to understand something of what it must have felt like in 1986. We experienced the clashes and arguments, and overcome them through drawings or by discussing images, by talking in those informal moments on the staircase or over lunch.
Hamish Lonergan
Book chapter TACK Book

November 1, 2022

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Hunting Tacit Knowledge: Encounters in architectural education at ILAUD and ETH

Hamish Lonergan
ABSTRACT
Tacit knowledge in architectural education is slippery. It encompasses a broad range of unconscious, embodied, social and otherwise hidden forms of knowing. On one hand, this means that it manifests in different ways depending on the pedagogical format or context. On the other, it resists explanation through the traditional, and largely explicit, tools of academic writing. Therefore, rather than seeking to define it, this paper proposes three approaches for locating and describing it. First, forms of tacit knowing—which we rely on, often without thinking, in our studio, school, or regional culture—become more visible in “moments of encounter” between communities. Second, discussions and negotiations of tacit knowledge often occur through architectural materials: drawings, models, texts, buildings. Third, “moments of tacit encounter” require more evocative and speculative methods of writing and representation, with different evidentiary standards. To test these approaches, this paper narrates two “moments of encounter” as case studies, encompassing different pedagogical formats, actors, writing methods, and revealing different forms of tacit knowledge.   In 2020, I arrived at ETH Zurich, where I began an autoethnographic study of tacit knowledge in discussions between critics across design studios. I was drawn to the realistic models of Studio Caruso, which I first encountered in my architectural studies in Australia. There, they represented a hitherto unimaginable departure from model abstraction. In Zurich, though, some critics were less dazzled, questioning the labor they required. Elsewhere, realistic models had been at the center of right-wing outrage over a kiosk designed by Caruso’s office in Escher-Wyss Platz in 2007. Around these models, the tacit architectural expectations of various groups seemed to reveal itself.   In 2021, I organized a summer school in Rotterdam on summer schools. Over five days, we re-enacted a charette exercise originally set for the 1986 edition of the International Laboratory of Architecture and Urban Design (ILAUD): the summer workshops founded by Giancarlo de Carlo in Urbino. Summer schools are ephemeral in nature—intense, productive, social, life-changing, but only for a few weeks—leaving little evidence of their tacit dimension for us to study today. Re-enacting it ourselves, coming from different educational backgrounds, we started to understand something of what it must have felt like in 1986. We experienced the clashes and arguments, and overcome them through drawings or by discussing images, by talking in those informal moments on the staircase or over lunch.
Essay Paper

Archives. On The Genesis of Architectural Design

ABSTRACT
This essay highlights the ‘archive’ as a productive and inspiring factor in architectural design. As one can observe in publications, interviews, and lectures of some contemporary architects as Sauerbruch Hutton, Brandlhuber I Kniess, Valerio Olgiati, John Pawson or EM2N for example, different kinds of archival operations might form triggers for the generic processes of basic conceptions as well as for project-oriented design actions and last but not least for the attitude and stabilization of the architects’ work and profile. With the lens of interpretations of the archive initiated by Michel Foucault and other French theorists of science and historians since the 1960s up to contemporary discourses, it is possible to show via analogies of acting and reflecting the powerful qualities of the ‘archive’ and of archival operations in the dynamic processes of architectural design.
Margitta Buchert
Essay Paper

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Archives. On The Genesis of Architectural Design

Margitta Buchert
Fig. 4: John Pawson, Cover Visual Inventory, New York: Phaidon Press 2012, Photo: a_ku
Fig. 5: John Pawson, Inside Visual Inventory: 20-21, New York: Phaidon Press 2012, Photo: a_ku
Fig. 7: EM2N, Cover Sowohl als auch: 32-33, Zürich: gta Verlag 2009, Photo: a_ku
ABSTRACT
This essay highlights the ‘archive’ as a productive and inspiring factor in architectural design. As one can observe in publications, interviews, and lectures of some contemporary architects as Sauerbruch Hutton, Brandlhuber I Kniess, Valerio Olgiati, John Pawson or EM2N for example, different kinds of archival operations might form triggers for the generic processes of basic conceptions as well as for project-oriented design actions and last but not least for the attitude and stabilization of the architects’ work and profile. With the lens of interpretations of the archive initiated by Michel Foucault and other French theorists of science and historians since the 1960s up to contemporary discourses, it is possible to show via analogies of acting and reflecting the powerful qualities of the ‘archive’ and of archival operations in the dynamic processes of architectural design.
Drawing Exhibition TACK Exhibition Object

Ulrich Mahler’s Exkursionszettel Wagbachniederung

Ulrich Mahler’s Exkursionszettel exemplifies the importance of embodied tacit knowledge in the management of constructed landscapes.
Johanna Just
Drawing Exhibition TACK Exhibition Object

May 29, 2022

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Ulrich Mahler’s Exkursionszettel Wagbachniederung

Johanna Just
© TACK
Ulrich Mahler’s Exkursionszettel exemplifies the importance of embodied tacit knowledge in the management of constructed landscapes.
Model TACK Exhibition Object

Four Square Levels

Complete perspective of the empty object.Carabanchel, Madrid, 2021. Photo: Samuel H. Ramírez.
For the past three years, I have been researching assembly methods that can join together different post-consumer objects found in the street without the use of glue or screws.  
Samuel H. Ramirez
Model TACK Exhibition Object

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Four Square Levels

Samuel H. Ramirez
Complete perspective of the empty object.Carabanchel, Madrid, 2021. Photo: Samuel H. Ramírez.
© TACK
For the past three years, I have been researching assembly methods that can join together different post-consumer objects found in the street without the use of glue or screws.  
Newsletter Resources

The TACK Conference and TACK Exhibition 19-21 June 2023 in Zürich

After three intensive years of research and exchanges, the TACK project reached its last big milestone: the TACK Conference welcomed 150 people at ETH Zürich to discuss tacit knowledge in architecture and its various forms.
TACK Network ETH Zürich, Department of Architecture
Newsletter Resources

July 13, 2023

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The TACK Conference and TACK Exhibition 19-21 June 2023 in Zürich

TACK Network ETH Zürich, Department of Architecture
© TACK
After three intensive years of research and exchanges, the TACK project reached its last big milestone: the TACK Conference welcomed 150 people at ETH Zürich to discuss tacit knowledge in architecture and its various forms.
Conference Paper Open Access Publication

Everyday Practice As Paradigm To Study Architectural Contemporary Codes

© Claudia Mainardi
Claudia Mainardi's contribution presented at the CA2RE Delft conference has been a significant opportunity to discuss her doctoral research that, dealing with the present history, proposes an empirical approach: without aiming to achieve a definitive response, yet disentangling processes while being formed.
Claudia Mainardi
Conference Paper Open Access Publication

March 2, 2023

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Everyday Practice As Paradigm To Study Architectural Contemporary Codes

Claudia Mainardi
© Claudia Mainardi
© Claudia Mainardi
Claudia Mainardi's contribution presented at the CA2RE Delft conference has been a significant opportunity to discuss her doctoral research that, dealing with the present history, proposes an empirical approach: without aiming to achieve a definitive response, yet disentangling processes while being formed.
Book

Book Corner: “The Greek-Orthodox Church Allerheiligen in Munich”

The Greek-Orthodox Church "Allerheiligen", built between 1993 and 1995, in the Ungererstrasse in Munich is of particular importance for its community, the city and an outstanding example of ecumenism.
Korinna Zinovia Weber
Book

October 20, 2023

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Book Corner: “The Greek-Orthodox Church Allerheiligen in Munich”

Korinna Zinovia Weber
The Greek-Orthodox Church "Allerheiligen", built between 1993 and 1995, in the Ungererstrasse in Munich is of particular importance for its community, the city and an outstanding example of ecumenism.
Exhibition TACK Exhibition Object

Material Chariots

Material references play a vital role in the collaborative work of architects. At the office of De Smet Vermeulen architects in Ghent, chariots are used to expose samples of materials and combine them into palettes.
Paul Vermeulen De Smet Vermeulen architecten
Exhibition TACK Exhibition Object

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Material Chariots

Paul Vermeulen De Smet Vermeulen architecten
© TACK
Material references play a vital role in the collaborative work of architects. At the office of De Smet Vermeulen architects in Ghent, chariots are used to expose samples of materials and combine them into palettes.
Newsletter

Map of Mobility – A visualisation of research movement

Gennaro Postiglione initiated the idea of a “TACK Map” and shares with us his thoughts on the map showing the research movement of the TACK doctoral students.
Gennaro Postiglione
Newsletter

May 22, 2022

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Map of Mobility – A visualisation of research movement

Gennaro Postiglione
Gennaro Postiglione initiated the idea of a “TACK Map” and shares with us his thoughts on the map showing the research movement of the TACK doctoral students.
Exhibition TACK Exhibition Object

Tactiles

Tactiles are relational objects that foster interactive approaches of un-learning restrictive spatial codes, re-learning through encounters of intimacy, embodiment and connectedness, and co-learning through shared performative experiences.
Katharina Kasinger
Exhibition TACK Exhibition Object

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Tactiles

Katharina Kasinger
© TACK
Tactiles are relational objects that foster interactive approaches of un-learning restrictive spatial codes, re-learning through encounters of intimacy, embodiment and connectedness, and co-learning through shared performative experiences.
Note Review Site writing

Book Corner: ‘Pre-Positions’, in Site-Writing: The Architecture of Art Criticism by Jane Rendell (2010)

Rendell, J. (2010) ‘Pre-Positions’, in Site-Writing: The Architecture of Art Criticism
The introduction to the author’s positional body of work, sets the theoretical and intellectual context for the ideas underpinning Site-Writing as a practice and their aims in giving voice to this form of practice. The author uses seminal writers on phycology, art-practice and philosophy as figures to guide their later theories and discusses the relationship between architecture and art-critique as reflective and positional practices.
Jhono Bennett Anna Livia Vørsel
Note Review Site writing

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Book Corner: ‘Pre-Positions’, in Site-Writing: The Architecture of Art Criticism by Jane Rendell (2010)

Jhono Bennett Anna Livia Vørsel
Rendell, J. (2010) ‘Pre-Positions’, in Site-Writing: The Architecture of Art Criticism
The introduction to the author’s positional body of work, sets the theoretical and intellectual context for the ideas underpinning Site-Writing as a practice and their aims in giving voice to this form of practice. The author uses seminal writers on phycology, art-practice and philosophy as figures to guide their later theories and discusses the relationship between architecture and art-critique as reflective and positional practices.
Review

Book Corner: “Architecture: The History of Practice.” by Cana Cuff (1992)

© Dana Cuff
The book offers an in-depth analysis of the architectural practice culture –focusing specifically on the American one– as a “social construction”. It puts attention on the tacit knowledge seen as able to disentangle the substance of a professional ethos –affecting both espoused theory and theory-in-use, and it concludes that the design process is based on collective actions as the result of negotiations within a social process.
Claudia Mainardi
Review

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Book Corner: “Architecture: The History of Practice.” by Cana Cuff (1992)

Claudia Mainardi
© Dana Cuff
The book offers an in-depth analysis of the architectural practice culture –focusing specifically on the American one– as a “social construction”. It puts attention on the tacit knowledge seen as able to disentangle the substance of a professional ethos –affecting both espoused theory and theory-in-use, and it concludes that the design process is based on collective actions as the result of negotiations within a social process.
Book chapter Open Access Publication

2021

Teaching Design in a Post-Rainbow Nation A South African Reflection on the Limits and Opportunities of Design Praxis

Example co-developed code of engagement (Author 2017), © Jhono Bennett
ABSTRACT
There has been an intense discourse on the relationship between inter-stakeholder university engagements, or service learning, and the broader society that South African universities claim to serve over the past decade in both local and international academia. The inherent problem within these power structures, the challenges to achieving mutually beneficial project outcomes and the growing concern of vulnerable, unheard institutional and individual voices are critical factors. The recognition of these dynamics within the emerging field of design research and design-led teaching is less nuanced in these debates. Training institutions of architecture have a rich history of undertaking service-learning initiatives to create value and learning for both the students and the stakeholders of such projects. Still, in South Africa, they are only now seen through a post-rainbow nation lens. The FeesMustFall movement is primarily driving this change. Larger institutions are recognising previously marginalised voices that now find traction in learning and practice across South Africa. This chapter reflects the author’s experience with emergent views and concerns as a researcher, lecturer and spatial design practitioner in Johannesburg. This section centres on learning regarding city-making in Southern Africa, and it presents two case studies followed by a discussion of growth opportunities.
Orli Setton, Eric Wright, Claudia Morgado, Blanca Calvo, residents and leaders of Denver Informal Settlement and the UJ Professional Practice students from 2013 to 2017.
Book chapter Open Access Publication

2021

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Teaching Design in a Post-Rainbow Nation A South African Reflection on the Limits and Opportunities of Design Praxis

Orli Setton, Eric Wright, Claudia Morgado, Blanca Calvo, residents and leaders of Denver Informal Settlement and the UJ Professional Practice students from 2013 to 2017.
Example co-developed code of engagement (Author 2017), © Jhono Bennett
© Jhono Bennett
Challenging practice students engaging in the workshop debate (The author’s photos), © Jhono Bennett
Students and staff of AT working with Denver residents on the Action Research Studio (Author’s photos), © Jhono Bennett
ABSTRACT
There has been an intense discourse on the relationship between inter-stakeholder university engagements, or service learning, and the broader society that South African universities claim to serve over the past decade in both local and international academia. The inherent problem within these power structures, the challenges to achieving mutually beneficial project outcomes and the growing concern of vulnerable, unheard institutional and individual voices are critical factors. The recognition of these dynamics within the emerging field of design research and design-led teaching is less nuanced in these debates. Training institutions of architecture have a rich history of undertaking service-learning initiatives to create value and learning for both the students and the stakeholders of such projects. Still, in South Africa, they are only now seen through a post-rainbow nation lens. The FeesMustFall movement is primarily driving this change. Larger institutions are recognising previously marginalised voices that now find traction in learning and practice across South Africa. This chapter reflects the author’s experience with emergent views and concerns as a researcher, lecturer and spatial design practitioner in Johannesburg. This section centres on learning regarding city-making in Southern Africa, and it presents two case studies followed by a discussion of growth opportunities.
Paper

From Unconventional Households to Unconventional Affordable Housing

ABSTRACT
Over the past years, a multi-disciplinary group of scholars at Politecnico di Milano (UHUAH!) has been exploring how contemporary social and demographic dynamics challenge housing policies and projects. These issues have been at the core of teaching activities in design-based studios involving architecture students. Spurred on not only by the literature on the subject (Ronald/Elsinga, 2012), we are engaged in field research investigating the state of the art of dwelling practices, with the aim to develop alternative housing solutions (and typologies) able to overcome the distance that emerged between demand and supply. A gap mostly depending on the major changes that happened in the last twenty years in households composition, and in what is typically referred to as the family (Carlson/Meyer, 2014), with the consequent crisis of the ideal equivalence between “the family” and the “apartment typology” (Star strategies + architecture, 2016). The paper will therefore present relevant case studies from the Research by Design explorations conducted on existing building stock, a decision taken to empower Adaptive Reuse as a sustainable approach also in Housing. Our Design Manifesto considers the apartment as constituted by a system of independent rooms, in which the bed is not anymore the core device, while the connective space is interpreted as common shared areas (Connective = Collective).
Gennaro Postiglione Paola Briata Constanze Wolfgring
Paper

October 10, 2022

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From Unconventional Households to Unconventional Affordable Housing

Gennaro Postiglione Paola Briata Constanze Wolfgring
© Gennaro Postiglione
Drawing focusing on the life around furniture (@ReCoDe-DAStU)., © Gennaro Postiglione
Design strategy: a set of devices is set in place in dialogue with the existing structure (@ReCoDe-DAStU)., © Gennaro Postiglione
External view of one of the La Viridiana blocks (@ReCoDe-DAStU)., © Gennaro Postiglione
© Gennaro Postiglione
ABSTRACT
Over the past years, a multi-disciplinary group of scholars at Politecnico di Milano (UHUAH!) has been exploring how contemporary social and demographic dynamics challenge housing policies and projects. These issues have been at the core of teaching activities in design-based studios involving architecture students. Spurred on not only by the literature on the subject (Ronald/Elsinga, 2012), we are engaged in field research investigating the state of the art of dwelling practices, with the aim to develop alternative housing solutions (and typologies) able to overcome the distance that emerged between demand and supply. A gap mostly depending on the major changes that happened in the last twenty years in households composition, and in what is typically referred to as the family (Carlson/Meyer, 2014), with the consequent crisis of the ideal equivalence between “the family” and the “apartment typology” (Star strategies + architecture, 2016). The paper will therefore present relevant case studies from the Research by Design explorations conducted on existing building stock, a decision taken to empower Adaptive Reuse as a sustainable approach also in Housing. Our Design Manifesto considers the apartment as constituted by a system of independent rooms, in which the bed is not anymore the core device, while the connective space is interpreted as common shared areas (Connective = Collective).
Essay

Growing up as a Disney Girl: The Changing Spaces of the Feminine in Disney Films

Screenshot of Snow White from the 1958 Reissue trailer for the film Snow White and the Seven Dwarfs., © public domain
Invited to reflect on the contemporary cultural resonance of Disney in this essay, architecture historian Lara Schrijver explores how the emancipation of Disney’s female protagonists plays out in architectural scenographies. ‘I know my place! It is time you learned yours.’ Fa Zhou (father of Mulan)
Lara Schrijver
Essay

March 1, 2020

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Growing up as a Disney Girl: The Changing Spaces of the Feminine in Disney Films

Lara Schrijver
Screenshot of Snow White from the 1958 Reissue trailer for the film Snow White and the Seven Dwarfs., © public domain
Invited to reflect on the contemporary cultural resonance of Disney in this essay, architecture historian Lara Schrijver explores how the emancipation of Disney’s female protagonists plays out in architectural scenographies. ‘I know my place! It is time you learned yours.’ Fa Zhou (father of Mulan)
Conference Paper Paper Session ACTORS TACK Conference Proceedings

In Quest of Meaning – Revisiting the discourse around “non-pedigreed” architecture.

ABSTRACT
In their practice, architects never refer to something as “pedigreed” to describe their work. However, during the 1960s, Bernard Rudofsky introduced the term "non-pedigreed" architecture, which he attributed to edifices not designed by formally trained architects, but for various reasons, their status exceeds that of the "mere building". As a fact, since explicit knowledge around “non-pedigreed” architecture is scarce, architects rely mostly on interpretations. This contribution revisits several of these interpretations through the perspective of its "actors," referring to the scholarly work of selected architects, and it is structured into three parts. The first section introduces the motivations behind the study of "non-pedigreed" architecture, delving into questions of aesthetics and authorship. The second part explores the fruitful contradictions arising from the first section and focuses on the relationship between vernacular architecture and the concept of Time, as well as the development of craft skills. Finally, the third part examines specific case studies where the value of vernacular architecture shifts from being merely a reference point to becoming an integral part of the architectural production process.
Vasileios Chanis
Conference Paper Paper Session ACTORS TACK Conference Proceedings

June 21, 2023

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In Quest of Meaning – Revisiting the discourse around “non-pedigreed” architecture.

Vasileios Chanis
Figure 1 and Figure 2: Jacques Tati, Mon Oncle, 1958 (Directed and produced by Jacques Tati)
ABSTRACT
In their practice, architects never refer to something as “pedigreed” to describe their work. However, during the 1960s, Bernard Rudofsky introduced the term "non-pedigreed" architecture, which he attributed to edifices not designed by formally trained architects, but for various reasons, their status exceeds that of the "mere building". As a fact, since explicit knowledge around “non-pedigreed” architecture is scarce, architects rely mostly on interpretations. This contribution revisits several of these interpretations through the perspective of its "actors," referring to the scholarly work of selected architects, and it is structured into three parts. The first section introduces the motivations behind the study of "non-pedigreed" architecture, delving into questions of aesthetics and authorship. The second part explores the fruitful contradictions arising from the first section and focuses on the relationship between vernacular architecture and the concept of Time, as well as the development of craft skills. Finally, the third part examines specific case studies where the value of vernacular architecture shifts from being merely a reference point to becoming an integral part of the architectural production process.
Book chapter TACK Book

Decoding a Practice’s DNA: Multiple registers of tacit knowledge

ABSTRACT
In the manifold spectrum of how tacit knowledge can be conceived in architecture, the contribution aims to investigate that embedded in the architects' design process by reflecting on the codes they employ.   If the vectors are tools or communicative materials –i.e., drawings, sketches, models, texts, etc.– used for transmission, the codes are here interpreted as those characters –whether in the form of recurring patterns or aesthetic choices, technical solutions, vocabulary, etc.– that define the specificity of a practice. As the DNA of an office, and not just of its principal, as Rem Koolhaas argues (Winston, 2016), they articulate across different levels depending on the context within which they are shared: spanning from the ones used within the practice itself –forming the basis for collaboration between different project team members;– to those adopted externally to communicate with both clients and an extended community of practice. Differences in terms of codes might parallel diverse methods for their investigation. Indeed, for the former, the use of an ethnographic approach capable of unpacking specificities from within seems to be the most adequate –i.e., revealing how the implicit values of a practice are transferred into form through a collective process mediated by multiple actors;– for the latter, instead, it would be more proper to employ public occasions as a pretext through which to decipher a shared “language.” (Eco, 1976).   In general, the paper argues that codification processes are necessarily conditioned by the context in which they take place, by the positioning within the disciplinary debate, and by the actors (Latour and Yaneva. 2008) participating in their development. These closely interrelated aspects constitute the tacit knowledge inherent to a practice. Hence, although capable of changing over time, such knowledge is a unique and characterized product for an office. At the same time, it is the contribution that each firm provides in shaping its community of practice, whose shared knowledge unfolds through exchanges and encounters.
Claudia Mainardi
Book chapter TACK Book

November 1, 2022

View

Decoding a Practice’s DNA: Multiple registers of tacit knowledge

Claudia Mainardi
ABSTRACT
In the manifold spectrum of how tacit knowledge can be conceived in architecture, the contribution aims to investigate that embedded in the architects' design process by reflecting on the codes they employ.   If the vectors are tools or communicative materials –i.e., drawings, sketches, models, texts, etc.– used for transmission, the codes are here interpreted as those characters –whether in the form of recurring patterns or aesthetic choices, technical solutions, vocabulary, etc.– that define the specificity of a practice. As the DNA of an office, and not just of its principal, as Rem Koolhaas argues (Winston, 2016), they articulate across different levels depending on the context within which they are shared: spanning from the ones used within the practice itself –forming the basis for collaboration between different project team members;– to those adopted externally to communicate with both clients and an extended community of practice. Differences in terms of codes might parallel diverse methods for their investigation. Indeed, for the former, the use of an ethnographic approach capable of unpacking specificities from within seems to be the most adequate –i.e., revealing how the implicit values of a practice are transferred into form through a collective process mediated by multiple actors;– for the latter, instead, it would be more proper to employ public occasions as a pretext through which to decipher a shared “language.” (Eco, 1976).   In general, the paper argues that codification processes are necessarily conditioned by the context in which they take place, by the positioning within the disciplinary debate, and by the actors (Latour and Yaneva. 2008) participating in their development. These closely interrelated aspects constitute the tacit knowledge inherent to a practice. Hence, although capable of changing over time, such knowledge is a unique and characterized product for an office. At the same time, it is the contribution that each firm provides in shaping its community of practice, whose shared knowledge unfolds through exchanges and encounters.