This manual is intended to provide students, teachers, counselors, and other school personnel with a set of practical instruments and procedures designed to measure the generalizable mathematics skills of students in secondary vocational programs. Three types of assessment instruments and procedures are presented and discussed: (1) student self-ratings, (2) teacher ratings, and (3) performance tests. The manual is organized around five major sections. The first section describes the list of generalizable mathematics skill areas and skills. The second, third, and fourth sections describe the student self-rating instrument, teacher rating instrument, and performance test, respectively. These three sections provide information regarding the assessment procedures, including instrument development, item analysis, reliability, validity, administration, scoring, and uses. The fifth section describes how the student self-ratings and teacher ratings can be used in combination with the performance test assessment instrument and how the scores may be used and interpreted. The appendixes present the list of generalizable skills color charts; additional important mathematics skills; the student self-rating, teacher rating, and performance test instruments; skill profiles; and the performance test answer key. The information contained in this manual and the information obtained from the assessments can be used in individualized and group planning, assessment, curriculum development, instruction, and evaluation activities. (KC)