ADDIE stands for Analyze, Design, Develop, Implement, and Evaluate. It represents the five phases of this instructional design model where each step has an outcome that feeds the next step. This appears to be the starting point from which many models derive from and is widely used. ADDIE model is not flexible.
There are more than 100 different ISD models, but almost all are based on the generic “ADDIE” model. Each step has an outcome that feeds the subsequent step.
Analysis –> Design –> Development –> Implementation –> Evaluation
I found this ongoing debate on ‘How relevant is the ADDIE model in 2009?’. It has interesting arguments from many ID’s.