De Casseres, who introduced the term "planology" in 1929, was the representative of the dynamic region: change as a driving force, through which the old must give way to the new.In 1918, the Dutch Institute for Public Housing and Urbanism was founded with D.Hudig as its secretary-director. Proposals emerged for a package of measures needed to address the legal, administrative, medical and socioeconomic problems of cities and regions in industrializing countries. A prerequisite for humanized urbanism was the restoration of the relationship with nature. Finding a suitable design for regional cohesion Hudig left to designers with a corresponding vision such as de Casseres, Dudok, Van Eesteren, Granpré Molière, Verhagen and Witteveen. One spoke of a "rural city. This concept was tested in some urban plans in the 1920s and applied in the 1930s in Amsterdam's Algemeen Uitbreidingsplan, Witteveen's expansion plans for Rotterdam, de Casseres' expansion plan for Eindhoven, Berlage's expansion plan for Utrecht and Groningen and Dudok's expansion plan for The Hague. The various chapters delve deeper into the content of de Casseres's publications and his work. Especially the issues surrounding the expansion plans of North Brabant from a Catholic perspective.