The chair of Rational Architecture (RA) focuses on a cultural tradition of architecture that builds on the idea of ‘type’ as the constant carrier of architectural design. The search for variations of this constant, in order to respond to contemporary building questions and conditions, defines the working field of the chair. The formal basis of architecture, frequently within the spatial context of existing urban constellations, is central at this. By creatively questioning the formal fundament of architecture the chair aims at stimulating architectural research by design. With the establishment of the design based research group Bauhütte applied research finds its place at the chair RA.