This is a 5 minute screencast on how to use the Matching Policy areas of Knowledge Base creation and management in Data Quality Service (client) for SQL Server 2012 RC0.  The heart of the Matching Policy area is the Matching Rules section, where you define and test one or more rules so that you can get information to help you improve the quality of data for the selected domain.  The idea is that as you create, monitor and tune the matching policies (sets of rules) you can then use the publish the results as part of your Knowledge Base, which you then can use on one or more Data Quality cleansing projects.