Today’s construction management tools do not represent and communicate the spatial and temporal, or four-dimensional, aspects of construction schedules effectively. My research group formalizes this knowledge within a 4D(3D plus time) framework. This formalized knowledge enables project managers to create and update schedules rapidly and to integrate the temporal and spatial aspects of a schedule as 4D models. These intelligent 4D models support computer-based analysis of schedules with respect to cost, interference, safety, etc., and improve communication of design and schedule information.