An idea you need to know One of the most important and useful ideas in software also happens to be one of the least well known. It was introduced in a paper that David Parnas wrote in 1979, entitled Designing Software for Ease of Extension and Contraction. Program families. Following on from an earlier paper that introduced the idea of “program families”—that when you design software you should realize that you’re designing a whole family of programs, not just one—this paper address...
