Competencies versus Roles: We’ve seen a positive move toward emphasizing competencies in a team rather than roles or titles. As teams make that change, we see fewer “It’s not my job” excuses and more “How can I help?” conversations. Team members will continue to have core competencies in some areas more than others, but they may not identify as strongly with a particular role. For example, saying, “I am a tester” really means, “I perform mainly testing activities because that is my primary passion and strength. I can provide leadership and guidance to others, and I may also help in other areas.”
Source: More Agile Testing, Janet Gregory and Lisa Crispin, Addison-Wesley,