This theoretical model for message design directs the designer to design a block of time that optimizes the information load and message complexity within the constraints of the receiver's abilities and experience, the requirements of the source, and the capabilities and limitations of the medium. (Author/JEG)

Advances a theoretical perspective for analyzing education and instructional technology as disciplines using the science of semiotics as a framework for identifying the components, relationships among components, and meanings of components in educational systems. A 30-item reference list accompanies the text. (Author/JL)