The Kirkpatrick model is a popular framework for evaluating training programs that consists of 4 levels: reaction, learning, behavior, and results. The original 1959 model has since been updated for a new world of work. Level 1 assesses learner reactions. Level 2 evaluates learning outcomes. Level 3 looks at applying learning to change behaviors. Level 4 examines business results from training. Starting evaluation at Level 4 helps define desired results and link training to business goals. Determining performance indicators at Level 3 links training to behaviors. Levels 1 and 2 should be combined to optimize learning delivery and support.