I have never used SAM (Successive Approximation Model) on any of the projects I have worked on as an instructional designer. In graduate school at the University of Texas at Austin I was trained in the ADDIE approach. ADDIE stands for Analyze, Design, Develop, Implement, and Evaluate. I completed an online program in online education at the University of Wisconsin at Madison. Their approach is ADIE. They combine design and develop into one step.