In 4D service 3D-model elements and activities is connected to project time schedule, known as 4D modeling. This provides information for constructability analysis and Time scheduling. These services are available in two levels. First level, is an element-based level. In this level, we add model elements and related information to the project time-line. And therefore, we provide 4D simulation based on 3D-models alone. Second level is an activity-based level. This level can be provided after implementation of cost estimation service (5D). Here, we prepare time-based information of Cost, MTO, Activity, Resource, Machinery and other related data. Noteworthy, implementing 4D service also provides high level information needed for project management processes, including logistics, procurement, cost and cash flow.