[legion]

In my experience, as soon as you implement a Knowledge Management system, people immediately forget (sometimes intentionally) to document lessons learned, and no one ever reads them after the fact. Most are convinced that "my situation is different". You also have problems with knowledge items being mislabeled (usually the lesson is applied too narrowly) and are often poorly written, make it difficult for others to get anything useful out of them.

Most Knowledge Management systems are treated like a required place to throw documentation. The primary repository of knowledge is still experience.

This is unfortunate, but I've yet to think of a good way around these issues.