This manual describes the Mathematics Assessment Questionnaire (MAQ) and its development, provides relevant background from the research literature, describes approaches to the reporting and uses of the MAQ (including its use in instructional planning), and presents sample responses from students and classes. The MAQ provides teachers and students with a tool to understand aspects of constructing knowledge in mathematics classrooms for grades 7 through 9. The questionnaire is intended to survey students' thoughts and feelings about learning a particular aspect of mathematics--solving mathematical word problems. The MAQ provides additional, complementary information to that provided by teacher assessments or standardized tests of mathematical concepts and procedures. The MAQ contains 162 statements and can be completed by most students within 40 minutes. In the first of 2 sections of the questionnaire, students solve a non-routine word problem and respond to 20 statements about what they did while solving the problem. In the second section, students respond to statements grouped within three activity settings (participating in the class as a whole, working with other students, and doing homework), after which the students' cognitive processes within each of these settings are again assessed, and affective beliefs, motivation, and attributions are studied. Three data tables and 10 figures are included. Appendices include sample responses for the fall 1988 sample; preliminary results of teacher ratings of items; statement numbers, scale response numbers for indicators, and interpretation of diagnostic indicators for beliefs, motivations, and attribution categories; the questionnaire; and the hand tally form. (TJH)