Below is a great video from Dan Pink.
In it, Dan presents some excellent research into motivation which will help leaders decide what to be clear about if they're trying to encourage good performance. A lot of it ties in with the earlier post on Clarity Rules: Why clearly linking reward to your change programme is harder - and easier - than you thought.
What's more, Dan's animation is also a terrific example of communicating something complex in a very understandable way.
Have a watch.