BIM models can also be used in building documentation or for construction progress control with regard to deadlines. Therefore, they also serve as basis of project controlling. When comparing the actual dates with the planned state of dates, discrepancies can easily be determined and areas with delayed performance can quickly be identified. By deciding on countermeasures early on, delays in schedules can be considerably reduced. Documentation and changes in the project can also be recorded and are transparently stated with all their effects.