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

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.

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

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.

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

I don't like the feeling, but I've got to say that a little fear makes me a more focused, more responsible programmer.

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