The ADDIE model is a five phase instructional design process used to develop training programs. The five phases are analysis, design, development, implementation, and evaluation. In the analysis phase, training needs are identified through requirements, gaps, and audience analysis. The design phase involves writing objectives, defining measurements, and determining instructional strategies. Development creates instruction on knowledge, skills, and behaviors. Implementation prepares technology, support, trainers, and learners for training sessions. Evaluation assesses return on investment, on-job performance, tests, and learner reactions.