NASA has a great set of lessons learned here. I sometimes call “lessons learned” “lessons not learned” since many organizations make the same mistakes over and over.
Here are my favorites from the list:
- All problems are solvable in time. Make sure you enough schedule contingency or the project manager that takes your place will.
- People who monitor work and don’t help get it done never seem to know what is going on.
- Sometimes the best thing to do is nothing.
- Never assume that someone knows something or has done something. Ask them.