The instructional systems development (ISD) approach for the development and accomplishment of vocational training programs provides a methodology for gathering and analyzing job information, developing instructional materials in a variety of media, conducting instruction, and evaluating and improving the effectiveness of training programs. This approach is based on evidence that the tasks performed on a job can be identified and analyzed and that learning objectives and instructional strategies to achieve these objectives can be developed and structured so that instruction will be efficiently and effectively conducted. The procedural model and flowchart for ISD is comprised of five phases. Each phase--analyze, design, develop, implement, and control--is made up of a series of steps. The five phases and 19 steps are interrelated and form a closed-loop instructional system. Some of the steps can be conducted concurrently, while others must be done sequentially. ISD procedures are widely accepted and have been used by the military, government, and some companies for a number of years. The entire process has been documented and is available through government publications. The military has prepared a large selection of performance-based, criterion-referenced courses using ISD methodology that have been packaged for civilian applications. (YLB)