The original manifesto makes the correct mindset super-obvious. It's very succinct and still relevant to today. Just take the first line, "Individuals and inte

The original manifesto makes the correct mindset super-obvious. It's very succinct and still relevant to today. Just take the first line, "Individuals and interactions over processes and tools." Interesting how most "Agile (tm)" is just selling processes and tools and pushing people into cookie-cutter roles. Even better is what I consider "line zero": "We are uncovering better ways of developing software by doing it and helping others do it," (emphasis mine). The lesson there being that the best people to teach you how to develop software are, in fact, developers (not managers, execs, consultants...).