Service reuse is both a feature and a benefit of service-oriented architecture (SOA). On the one hand, reuse is among the most easily measured behaviors in SOA. On the other hand, reuse statistics can be misleading: Counting service consumers masks variations in size and complexity, and even cost-based measures may not reveal underlying subtleties. Evolving from a simple approach to a more sophisticated one makes sense as long as you understand the strengths and limitations of the information at each stage. By incrementally adding both IT costs and a measure of business value for your services, it is possible to develop a straightforward approach that provides a comprehensive picture.