«Communities of Tacit Knowledge» focuses on the concept of «tacit knowledge» in architecture and urban design. Tacit knowledge is a specific type of knowledge that architects employ when designing, which is embodied in the material vectors that they design with – from treatises and drawings to models and buildings. The Innovative Training Network (ITN) will train young researchers in the development of advanced theoretical frameworks and specialized methods for the analysis of the specific knowledge that architects and urban designers use when designing buildings and cities. It focuses on the characteristics, the dissemination and the heuristic potential of this knowledge. Structured around three training axes: (1) Approaching Tacit Knowledge: Theories and Histories, (2) Probing Tacit Knowledge: Concrete Cases and Approaches, and (3) The Projective Capacities of Tacit Knowledge, the TACK ITN for the first time combines the expertise on tacit knowledge that has been developed at ten different research centres in Europe. Together with three cultural institutions and nine architecture firms, these ten research centres will train a group of scholars to explore and conceptualize the very character of tacit knowledge to better understand its potential in addressing new and pressing issues in the built environment from alternative vantage points. This powerful combination of expertise from industry and academia will introduce young researchers to new heuristic methods.