 The conceptual innovation of most of these housing designs was a or structural and functional module, which was part of a grid.Sauer's advocacy work with the Philadelphia Redevelopment Authority on the Morton Urban Renewal Project (MURP) for a low-income minority neighbourhood helped to define his career interest in advocating for good design and planning for people left out of the market economy and generally neglected by mainstream design professionals.This interest led him to employ the social sciences (especially social-psychology) in his design research and programming in order to better understand the interrelationships between architecture and the occupancy needs of the anticipated users of his sites and buildings.