Some amateur human engineers imagined that they might have a problem with a keyboard in which the top row of keys was displaced from standard. Like almost all of the researchers, they never noticed. For workload reasons, we have had to use many temporary secretaries from manpower agencies. This has proved unexpectedly easy. I saw one temporary typing at a terminal twenty minutes after her arrival under the supervision of a regular secretary working at another terminal in the same office.
Display terminals are much better and cheaper than hard copy terminals.
The latter are noisy, and waste paper gets spread around. Of course, there needs to be a good accessible printer, but many people print only daily. Having many display terminals, provided they have at least minimal facilities, is more important than having a few super terminals. We will shortly have a really good experimental test of this proposition, because the Computer Science Department now has perhaps 75 terminals in offices and about 15 Xerox Alto systems in terminal rooms. I am betting that people who have Datadiscs in their offices will use them rather than take their papers to a terminal room down the hall.