Testing is not the point. The point is about responsibility.

The community isn't nearly as afraid as it thinks it is.

Make it work, make it right, make it fast.

Sometimes the problem has to mature before the solution can mature.

I tell people to start implementing when they are pretty sure there aren't more important stories out there. An iteration's worth of data is worth months of speculation.

The system metaphor is a story that everyone--customers, programmers, and managers--can tell about how the system works.

Responsible Development shares many practices with XP but the roots are different. Responsible Development's values are honesty, transparency, accountability and responsibility. These lead me to pairing, test-first, incremental design, continuous integration and so on because they support the values.