The domain of instructional design encompasses four major areas of theory and practice: instructional systems design, message design (technological applications), instructional strategies, and learner characteristics.
Three theories provide the basis for the development of instructional technology. They are: behaviorism, cognitivism and constructivism. The technology dimension can be organized into four categories: print media, audiovisual media, electronic media, and integrated media.
The function of this domain is to manage the interface between learner and instructional materials or systems.
The AECT Definition and Terminology Committee divides the management domain into four subdomains, namely: 1) project management, 2) resource management, 3) management of delivery systems, and 4) information management.
The evaluation domain is classified according to the object being evaluated. Common distinctions are programs, projects and products or materials.