One of the most interesting ideas at Parc was: “every invention has to be engineered for 100 users”. So if you do a programming language or a DTP word processor, etc, it has to be documented for and usable by 100 people. If you make a personal computer, you have to be able to make 100 of them. If an Ethernet, it has to connect to 100 devices, etc.
—, What made Xerox PARC special?