The purpose of this study was to determine operational procedures for a mobile laboratory disseminating Business Education Data Dissemination System (BEDDS) materials and other instructional materials, and to make recommendations for improving its operation to better meet the needs of business educators in California secondary schools. Objectives were to determine how materials were used, which were used most frequently, what additional materials should be prepared, and when, where, and how to schedule the mobile laboratory visits. An instrument was developed to record the materials most used, and a questionnaire was sent to 400 business educators (306 responded) who had visited the mobile lab. Major findings and conclusions included these: The lab was found to be a very effective means of disseminating materials; the most popular materials were in the areas of typewriting, bookkeeping, distributive education, job applications, and making change; and teachers preferred to visit the lab at their own schools either after school or during their preparation periods. Recommendations included continuing operation of the mobile lab, scheduling the lab in individual schools, and adding a variety of multimedia materials to the lab. An appendix contains samples of BEDDS forms, and forms, worksheets, and tables used in this study. (BL)