In her talk Stories of Houses: investigating ordinary practices in post-War Milan (held in the framework of TACK training axis 2, module 1 “Probing Tacit Knowledge” on 26 April 2021), Gaia Caramellino questioned the practices of tacit knowledge embedded in the particular cultural network engaged in the design and construction of post-WWII Milan ordinary residential environment. She points at the production of this environment as the place of encounter between different forms of knowledge and the site of negotiation between different communities of practice, with their diverse agenda, rationales and modus operandi. The co-production of this environment offered a ground to discuss the codification of tacit forms of architectural knowledge, through the history of everyday practices and procedures and the sharing of implicit codes and unwritten conventions internally rooted in specific community of practices.