The primary uses of computers in the construction industry have been shifting, over the past four decades, from the evaluation of proposed design solutions, to their graphical (and other) representation, and more recently to facilitating collaboration among the various professionals who are involved in the design process. This paper argues that what may appear to be shifts in emphasis actually represents convergence on a single, original goal: the use of computers to help designers (and others who are involved in the design decision making process) to assess the quality, desirability, and the implications of their creations. Such assistance requires representation, communication, and analysis. The paper goes on to show how these individual parts can be joined into an integrated collaborative design environment, where they build upon and strengthen each other. Moreover, the paper argues that this convergence represents the future of CAAD research and development.