Jon Udell - Ward Cunningham’s Visible Workings:

"This isn’t just an innovative approach to software testing and workflow visualization. It’s also a radical statement about business process transparency. For most of us, most of the time, business systems are black boxes whose internal workings we can only discern in the outcomes of our (often painful) interactions with them. But what if you could find out, before pressing the Save button, what’s going on in that black box? And what if your way of finding out wasn’t by reading bogus documentation, but instead by probing the system itself using its own test framework?"