I occasionally asked Roberta her recollections, but I really didn’t interview anyone else. It is just a style thing, but it worked better for me to blitz through writing 400 pages, and then have people read it and tell me what I messed up.
After the book was written I sent copies to 50 ex-Sierra employees, as well as to some of the people mentioned in the book. Some agreed with what I wrote and some didn’t. There were some serious gaps in my knowledge. Based on feedback several sections of the book got rewritten and some new sections got added, and some got tossed.
I found it a very efficient way to work.