PEX = Program EXploration (a Microsoft Research project). I'm not really sure what this is, but a fellow RD, Barry Gervin, pointed it out to some of us MVPs recently after he visited a Microsoft Research "science fair".

Apparently, PEX automatically generates unit tests, allowing developers to find bugs early. In addition, it suggests to the programmer how to fix the bugs. Sounds too good to be true, but since it will enable "a new development experience" in Visual Studio Team System, I should probably keep an eye on it.

Maybe this will keep the TDD purists off of VSTS' back.