This graduationproject deals with an early post-war neighbourhood of Slotermeer, in Amsterdam Nieuw-West. The major problem in these neighbourhoods is a lack of social security which causes poor liveability. This lead to a study investigating which architectural and urban tools can influence social security and how these tools can be used to transform the courtyard houses of the Couperusbuurt. The outcomes of the study suggested a number of interventions to improve the architectural and urban structure. The measures are subsequently implemented in the design, building upon the (potential) qualities and overcoming its weaknesses. The main goal is to improve the inhabitants' perception of security.