We have a magic white board that can print out a big piece of paper showing everything on it. We also take pictures of it (and lesser white boards) to record designs agreed. Those pictures generally get put into a formal design document that is reviewed, signed, approved and all the rest of it.

Explanations work better without lengthy pauses. Ideally, I can explain the thing without stopping too long.

> Why don't you use documentation?

I do if it's necessary. Sometimes it's not necessary.

> Oh, and how do you version control the white board?

I don't.