In the 1960s, the imperative to move architecture on to a more scientifi c footing led to an interest in evaluating the performance of buildings in use and feeding back the results. In the 1970s, this early promise became severely eroded. Since then, there have been several cycles during which interest and capabilities have grown and then faded away. Why has it been so diffi cult for the industry, its clients and government to adopt routine building performance evaluation (BPE) and feedback, and what can be done about it?