The application of computer tools to mediating and promoting collaborative design efforts between mutually distant parties has become feasible. Technology is again ahead of practice, and problems of assimilation have only begun to be explored. This paper postulates the requirements of environments for computer-mediated collaborative design in architectural practice, drawing upon experiences of design collaboration among schools of architecture on three continents and supplementing these with enquiries into design excellence in practice.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>