They come directly from Robert Martin's 2000 paper, 'Design Principles and Design Patterns'[1] [1] - https://web.archive.org/web/20150906155800/http://www.obje

They come directly from Robert Martin's 2000 paper, 'Design Principles and Design Patterns'[1] [1] - https://web.archive.org/web/20150906155800/http://www.objectmentor.com/resources/articles/Principles_and_Patterns.pdf https://web.archive.org/web/20150906155800/http://www.object...