The purpose of the CAT·3 Constructed Response Mathematics Scoring Manual is to assist teachers in the scoring of student responses. Discussion begins with a consideration of the test-taking environment and the context in which students write the tests. An appreciation of the preparation students have had for the tests and the context in which they write them assists the scorer in reliably applying the scoring guide. Next, the manual presents and explains the scoring package, including the scoring guide and accompanying anchor papers. The final section describes how to use the scoring guide and provides tips that assist the scorer in embarking upon an efficient scoring process.