BIM (CAD in 3 D) is a great collaboration tool for large project involving many professionals engineers of various trade and architects. It avoid many error at the design phase, less costly then on construction site.
Adding the 4 dimension with time (schedule) can bring new improvement. Such as changing the sequence of work.
I was involve in a project using BIM, but we didn't try to link with the schedule.
Anyone here was involve in a 4 D BIM Saving Changes...