If you're having trouble succeeding, fail.

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

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.

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

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

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