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Gerlach and Ely is a relatively simple prescriptive design method and model.
Here is a summary with a figure taken from a Carl Berger course on Educational Software Design and Authoring
- Gerlach, Vernon S. & Donald P. Ely. Teaching & Media: A Systematic Approach. Second edition. (Englewood Cliffs, New Jersey: Prentice Hall, Inc., 1980)