Architect normally do 3D sketches at construction sites to help workers better understand what they were supposed to build. Workers will use the BIM models at the job site, in 3D, to better understand what they are building. Automated QTO and costing will be a byproduct of the model. Contract document sets have grown in quantity of pages in the last few decades. If you review the number of drawings it took to build a major building 80 years ago, finding a set of over 100 sheets would be the exception. Today, contract documents for a similar building could easily number in the hundreds, if not thousands of sheets. It is hard to imagine how they can be comprehended. Perhaps the future will find no sheets; the BIM project file will set the contract scope of work, with no specific drawings.