THIS PAPER DEVELOPS PROCESS MODELING BY LOOKING AT THE FLOW OF WORK THAT MUST BE DONE BY A DESIGNER AND MANUFACTURING ENGINEER IN THE COURSE OF PRODUCING A COMPLEX MOLD AND DIE. IT BEGINS WITH A SHORT HISTORY OF HOW MODELING AND MACHINING HAVE MOVED THROUGH THE PAST THREE DECADES AND THEN DEVELOPS THE CORE TECHNOLOGY THAT IS REQUIRED TO SOLVE COMPLEX PROBLEMS. THIS PAPER DISCUSSES THE ACTUAL NEEDS OF THE DESIGNER AND MANUFACTURING ENGINEER THAT CAN BE SERVED BY THE BASE TECHNOLOGY. THIS PAPER ALSO EXAMINES WHY SOME OF THESE PROBLEMS HAVE REMAINED UNSOLVED FOR SO LONG AND WHY GENERALIZED CAD/CAM HAS BEEN SO WEAK IN THE ATTACK UPON THEM.
