“The current model leads us to the conclusion that the limiting factor is the rate at which ideas or insights can be generated, and that the rate is not widely affected, if at all, by the number of men on the job, but rather by some capability level of the group.” Peter V. Norden 1

No software system of any realistic size is ever completely debugged—that is, error free

Edward Yourdon and Larry L. Constantine, 1975 1

What is the minimum of control that will maintain the process? Peter F. Drucker 1