This handbook is the third in a series of five competency-based resource guides on microcomputer applications for vocational teachers. The 13 units of instruction in this handbook are concerned with the content of the 14 competencies included in the category, "Planning, Executing, and Evaluating Competency-Based Instruction." Units are designed to prepare teachers to do the following: (1) differentiate among applications of computer-based instruction (CBI), (2) assess students' needs for specific CBI applications, (3) develop lesson plans for incorporating CBI, (4) select appropriate software for specific instructional purposes, (5) modify software, (6) design software, (7) prepare instructional materials to accompany software, (8) modify software documentation for specific instructional use, (9) orient students to CBI, (10) execute CBI, (11) individualize instruction with CBI, (12) assess students' microcomputer skills, and (13) evaluate and modify CBI based on student achievement. Components of each unit include unit and specific objectives, informative material, sample forms and evaluation measures, examples, a summary, achievement indicators, and a list of references. (YLB)