I think this sentences are really worth to remember. It is the reason I put here the text coming from Agile Principles, Patterns and Practices in C# Uncle Bob’s book:
Principles, patterns, and practices are important, but it’s the people who make them work. As Alistair Cockburn says: “Process and technology are a second-order effect on the outcome of a project. The first-order effect is the people.”
We cannot manage teams of programmers as if they were systems made up of components driven by a process. To use Alistair Cockburn’s phrase, people are not “plug-replaceable programming units.” If our projects are to succeed, we are going to have to build collaborative and self-organizing teams.