The scaling of a new assessment is a significant undertaking. The scaling of a new assessment designed as a multiple-level, criterion-referenced assessment is even more so. A Guttman approach to scaling was used with the Work Keys selected-response assessments, Reading for Information and Applied Mathematics. Assessments in development in the Work Keys project are designed to aid in the communication of needed workplace skills to business persons, educators, and learners. Pretests were conducted with 5,741 high school students and adult employees who took the Reading for Information assessment, and 6,236 examinees who took the Applied Mathematics assessment. The classification rate of individuals into appropriate skill levels was very good, exceeding 95 percent. A similar procedure was developed for the holistic score scale for Listening and Writing (3,319 examinees). Research on the operational forms of these assessments must be conducted to determine the reliability of parallel forms and the validity of the instruments for various uses. However, the scaling procedures appear to be working well. Five tables contain study findings, and one figure illustrates the scoring procedure. (SLD)