We're going to start off by looking at the definition of Instructional Systems Development. AFMAN 36-2234 defines ISD as follows: ISD is a deliberate and orderly, but flexible process designed for planning, developing, implementing, and managing instructional systems. It ensures that personnel are taught in a cost-efficient way the knowledge, skills, and attitudes essential for successful job performance. To help you better understand this definition, click on each part, or critical attribute, for an explanation of that component. These parts represent some of the key ideas you'll need to remember about ISD as you learn more about the model. deliberate and orderly flexible planning, developing, implementing, and managing instructional systems in a cost-efficient way the knowledge, skills, and attitudes essential for successful job performance Click next to check your understanding of this definition before moving on to the background of ISD.