This paper reports on research into the relationship between process design and management, and the level of integration between the design of a building and its HVAC (heating, ventilation and air conditioning) system. To measure the level of integration, a series of projects published in architectural journals was studied. Twelve criteria concerning integration were derived from this study. Professionals from the field were asked to review a range of projects using these criteria to determine the level of integration. There was substantial agreement on the level of integration in almost all cases The design process of more than 50 other projects was analysed by means of interviews focusing on the intensity of management procedures directed at process integration. The results of these projects were measured at three levels of integration based on the twelve criteria mentioned above. The study showed no significant correlation between management procedures and the level of integration.