A growing number of Computer Aided Architectural Design systems is installed in offices of architects. This study is dealing with the question how the work environment of designers and engineers should be redesigned for CAAD use. The research was conducted in two phases. First, a diagnostic study of the existing situation considering the traditional work space as well as experimental CAAD work areas which resulted in recommendations for the interior designer. In the second phase the redesigned office was evaluated using similar concepts and research methods as in the first study. Five research methods were used; inventory and environmental description, systematic observation of environment-behavior interactions, interviews, ergonomic measures and physical measurements. Thus results of the studies were presented in annotated floor plans, bridging the gap between researcher and interior designer.