Discussion of five projects of experimental housing estates, including a plan by Merkelbach and Elling for three hundred houses in Katwijk. Illustrations: various Illustrations/Housing construction Vlaardingen (design W. van Tijen & H.A. Maaskant); perspectives/Housing construction in extension plan "Molenblok" (Tulpstraat e.o.) Katwijk aan de Rijn; reproductions/façade designs housing plan Vlaardingen, archn. Van Tijen and Maaskant; photographs/maquettes housing development plan Vlaardingen, archn. Van Tijen and Maaskant; original subdivision plan/Housing construction in expansion plan "Molenblok" (Tulpstraat e.o.) Katwijk aan de Rijn; new subdivision plan/Housing construction in expansion plan "Molenblok" (Tulpstraat e.o.) Katwijk aan de Rijn; reproductions/perspective drawings housing development plan Vlaardingen, archn. Van Tijen and Maaskant; reproductions/plans housing development plan Vlaardingen, archn. Van Tijen and Maaskant; subdivision plans, facade views, floor plans, photographs of maquettes/Hengelo housing development plan, Vlaardingen plan, Tilburg plan and Leiden plan; reproduction/situation housing development plan Hengelo, archn. Van den Broek and Bakema; reproductions/facade designs housing plan Hengelo, archn. Van den Broek and Bakema; reproductions/plans housing plan Hengelo, archn. Van den Broek and Bakema; reproductions/maquette housing plan "Oerle" at Tilburg, arch. Van Embden; reproductions/facade designs housing development plan "Oerle" in Tilburg, arch. Van Embden; reproductions/plans housing plan "Oerle" in Tilburg, arch. Van Embden; reproduction/perspective drawing housing plan "Oerle" in Tilburg, arch. Van Embden; reproduction/situation housing plan Leiden, archn. Verhagen, Kuiper, Gouwetor and De Ranitz; photo/maquette housing plan Leiden, archn. Verhagen, Kuiper, Gouwetor and De Ranitz; reproductions/plans housing plan Leiden, archn. Verhagen, Kuiper, Gouwetor and De Ranitz; reproductions/façade designs housing development plan Leiden, archn. Verhagen, Kuiper, Gouwetor and De Ranitz; reproduction/sectional view housing development plan Leiden, archn. Verhagen, Kuiper, Gouwetor and De Ranitz; reproduction/perspective drawings housing development plan Leiden, archn. Verhagen, Kuiper, Gouwetor and De Ranitz; reproductions/situations housing development plan Katwijk, archn. Merkelbach and Elling; reproductions/plans housing development plan Katwijk, archn. Merkelbach and Elling; reproductions/perspective drawings housing development plan Katwijk, archn. Merkelbach and Elling Design years: Vlaardingen;Hengelo