While state leaders understand the value of professional development, they also need to consider the costs. Such costs are some of the most difficult to calculate. If state leaders are going to pony up for improving the instructional skills of teachers and principals, they want to know that their dollars are well-spent. The same can be said for taxpayer parents, who increasingly find their children at home on early-release or late-start days. They want a reasonable assurance that noninstructional time is well-spent and is making a difference to their kids. A growing number of policy makers are insisting on evaluation--particularly tied to increased student learning. This article takes a look at the evaluation practices of some states.