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.

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

I mean, source code in files; how quaint, how seventies!

I'm not a great programmer; I'm just a good programmer with great habits.

Learning research tells us that the time lag from experiment to feedback is critical.

If you're having trouble succeeding, fail.

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