This chapter presents the generic schema match system, COmbination MAtch (COMA), which provides an extensible library of simple and hybrid match algorithms and supports a powerful framework for combining match results. The user can tailor match strategies by selecting the marchers and their combination for a given match problem. Hybrid matchers can also be configured easily by combining existing matchers using the provided combination strategies. Schema matching is the task of finding semantic correspondences between elements of two schemas. It is needed in many database applications, such as integration of web data sources, data warehouse loading, and XML message mapping. To reduce the amount of user effort as much as possible, automatic approaches combining several match techniques are required. While such match approaches have found considerable interest recently, the problem of how to best combine different match algorithms still requires further work.