We never have any understanding of any subject matter except in terms of our own mental constructs of "things" and "happenings" of that subject matte… - Douglas T. Ross

Mechanical drawings and blueprints are not mere pictures, but a complete and rich language. In blueprint language, scientific, mathematical, and geometric formulations, notations, mensurations, and naming do not merely describe an object or process, they actually model it. Because of broad differences in subject, purpose, roles, and the needs of the people who use them, many forms of blueprint have evolved, but all rigorously present well structured information in understandable form.

The APT and CAD Projects had one Air Force sponsorship, but it was actually a combination of about five or six projects, all going in parallel on both hardware and software matters, and I couldn't keep track of things, so I would take Polaroid pictures of the blackboard and then say what we had talked about into my dictating machine and my secretary would type it up.

This report summarizes the activities of the M.I.T. Computer-Aided Design (CAD) Project from 1 December 1959 through 3 May 1967 in the development of a generalized 'system of software systems' for generating specialized problem-solving systems using high-level language techniques and advanced computer graphics. Known as the AED Approach (for Automated Engineering Design) the Project results are applicable not only to mechanical design, as an extension of earlier development of the APT System for numerical control, but to arbitrary scientific, engineering, management, and production systems as well.