Eastern Arizona College has developed a modularized system of instruction for five vocational and vocationally related courses--Introduction to Business, Business Mathematics, English, Drafting, and Electronics. Each course is divided into independent segments of instruction and students have open-entry and exit options. This document reviews the processes utilized in selecting courses to be modularized, deciding on the instructional units for each course, and choosing the instructional methods to be used. Outlines of the modules for each course are presented, as are the pre- and post-testing procedures, comparisons of student achievement before and after the implementation of the modularized system, and student and faculty opinions of the new approach. Methods used for scheduling, registration, awarding credit, computing GPA, and meeting graduation requirements are also discussed. Conclusions based on the comparisons and opinions indicate that: (1) fewer units were awarded under the new approach; (2) modularization is more expensive in terms of equipment and instructor time; (3) modularization requires the instructor to work more closely with other departments in determining course content; and (4) students liked the ability to finish the course early, but they disliked the lack of teacher pressure in setting deadlines. Recommendations for improvement are made. (DC)