In BIM process, we join and support many Project stages:

Tender
Calculation design
Detailed design
Documentation
Fabrication
Erection/construction
4D/5D construction Visualization

By using some strong CAD-BIM modeling tools, we can extract all output documentations for individual project phase from only one model. By that way, we can inherit all benefits from BIM:

Reducing Ricks and Re-works (time and cost)
Faster and easier and more accurately documentation extracting
Project coordination and collaboration (clash detection)