As a manager, the only thing you really manage is motivation - how hard someone works, on what, for how long. When you understand motivation, you can become not only a great practical manager, but a great leader. This authoritative guide describes the research on work motivation that can help you make changes in your own work and in teams you manage.
Before you buy training, add a new compensation system or reorganize jobs, use this guide to help you pinpoint the fixes that will make the most motivational impact.