The Successive Approximation Model (SAM) uses an iterative design-and-development process built around rapid prototypes, stakeholder feedback, and repeated refinement. Rather than completing every design decision before development begins, SAM allows teams to create an early representation of the learning solution, evaluate it, and progressively improve it.
This approach can reduce the risk of discovering major problems late in development because stakeholders and learners can respond to tangible prototypes throughout the process. It is particularly useful where requirements may evolve or where rapid implementation is important.
The waterfall model is comparatively sequential, with work progressing through predetermined stages. Backward design begins with desired outcomes and evidence of achievement before planning instructional experiences. ADDIE includes Analyze, Design, Develop, Implement, and Evaluate and can be implemented iteratively, but rapid successive prototyping is specifically associated with SAM.
For TD professionals, prototype-based development can improve alignment because assumptions about activities, content, navigation, or learner experience are tested before substantial resources are committed to final production.
Study Guide Topics: Instructional Design; SAM; iterative development; rapid prototyping; instructional-design models.
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