The various development plans which have been proposed for Amsterdam throughout this century in a way reflect the development in attitudes to notions of urbanity during this century. Berlage's plan for Amsterdam South originally indicated an influence from Camillo Sitte and the final plan of 1915 was based upon geometric rationalism and a formalised conceptual approach. In contrast the work of Van Eesteren, from 1927, which led to the extension plan for Amsterdam of 1935 reflected to an extent indeterminate notions on design.