The document discusses the Four Levels of Evaluation model developed by Donald Kirkpatrick in 1959 to evaluate training programs. The four levels are: 1) learner reactions, 2) learning, 3) job behavior or transfer, and 4) observable results or impact. Level 1 evaluates learner opinions immediately after training. Level 2 assesses knowledge and skills learned. Level 3 evaluates on-the-job application of skills. Level 4 examines long-term business impact. Each level provides benefits for improving training and identifies weaknesses, though higher levels present more challenges to isolate the effects of training.