Abstract
The paper describes an environment that supports the collaboration of designers located at different sites. It argues that a requirement for such an environment is seamlessness, which means there is freedom to move between independent design activity and shared design activity with design artifacts. The collaborative design activity is formally specified, and the transitions between independent and shared activities are identified. Functions that support these transitions are supported by a system architecture composed of software agents. A prototype implemen tation of the architecture is used to illustrate a seamless environment for urban designers.
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