Designed to supplement the descriptive authoring flowcharts presented in a companion volume, this manual includes specific guidance, examples, and other information referred to in the flowcharts for the implementation of the third phase of the Instructional Systems Development Model (ISD). The introductory section includes definitions; descriptions of classification systems and flowchart symbols; instructions for using the Job Aid Manual; a description of the Job Aids Resource Manual; an explanation of the reporting system; information on the use of field surveys and panels; and an example of a closed form questionnaire together with the procedures for its administration. Activities covered in Phase III--DEVELOP are (1) specification of learning events/activities, (2) specification of instructional management plan and delivery system, (3) review and selection of existing materials, (4) development of instruction, and (5) validation of instruction. (LLS)