Built in the time-specific context of the seventies, the project of Lunetten is an interesting example of residential innovation in the Netherlands. Nominated experimental by the Dutch Experimental Housing Program of 1968- 1980, for its implementation of the design methods of Stitching Architecten Research (SAR), this project shows an early attempt at designing for adaptability with the separate design layers of a public urban tissue, a communal support structure and a private infill. This thesis aims to investigate how durable the experimental adaptability is in the project of Lunetten. More specifically it examines on one side the development of the physical infill structure and on the other side the progress of the infill concept over time. Firstly, the research concludes that apart from façade adaptations, the infill of Lunetten has not managed to adapt in the way it was intended. This because the infill structures of the dwellings either have remained unchanged since its construction or have been completely removed and replaced. Nevertheless, the project’s development also shows that the structure of the support indeed is flexible for change, even if it’s not through adapting the original infills. Secondly, the research finds that the quality of the infill concept has improved over time, with a professionalised design process and separate technical developments. At the same time it becomes clear that the technical coordination and coherence of the infill, have not yet reached its full potential in the Netherlands.