[[[Turns out this area is critical to explain to the reader the MCAD software companies were working with PDES as the CAX-IF to implement AP 203 3d assembly and piece part geometry and were not yet working on GD&T.There was ongoing research and development of the use of AP 224 but did not have the focusof PDES inc and MCAD because ...form features were a manufacturing concept...???So from a standpoint of PMI, it came later....]]]