Gerald Weinberg

“A system is never finished being developed until it ceases to be used.”

“We were doing incremental development as early as 1957, in Los Angeles, under the direction of Bernie Dimsdale [at IBM's ServiceBureau Corporation]. He was a colleague of John von Neumann, so perhaps he learned it there, or assumed it as totally natural. I do remember Herb Jacobs (primarily, though we all participated) developing a large simulation for Motorola, where the technique used was, as far as I can tell, indistinguishable from XP.”

“When program developers are not territorial about their code and encourage others to look for bugs and potential improvements, progress speeds up dramatically.”

“I believe, however, that humans are the only animals that we know who invents tools for working together - and they have done that as long as we have considered them human.”