I recently read "Drive: The Surprising Truth About What Motivates Us" by Daniel H. Pink, which discusses motivation and the scientific principles that managers in the business world are not putting into practice today. One of the things that I found interesting about this book was incentives around performance. If an employee already enjoys what they are doing, they are internally motivated. Therefore if you then provide them with a monetary reward, that could actually de-motivate them. Since I do have a relatively new team, I found this book helpful as far as how I should incentivize each individual.