This document discusses the relationship between software testers and developers. It notes that software development requires teamwork, but testers and developers sometimes have differing perspectives that can cause trouble. While testers are often seen as "failed programmers", the document argues this is a myth, and that development bias is the real root of prejudice against testers. It emphasizes that both testers and developers are equally important, and that adopting Agile practices can help break down old stereotypes by promoting collective team responsibility over individual roles.