What Makes a Good Design Document?

Some times I wrote a post and I let it sleeping for a weeks, later I review it, so don't be surprise if read this talking about What makes a good design document?.

From time to time, Slashdot posts are insightful ones, such as this comments about testing the desing, traceability, and interesting as it is, it let us a pair of very interesing comments answering their points of view.

Nothing in common with spanish slashdot, full of trolls and bored teenagers.