This document discusses the Kirkpatrick model for evaluating the effectiveness of training and development programs. It describes the four levels of the Kirkpatrick model: reaction, learning, behavior, and results. At each level, different methods are used to measure the impact of training. The reaction level measures participant satisfaction. The learning level assesses knowledge gained through pre- and post-tests. Behavior is evaluated by observing changes in on-the-job performance after training. Finally, results determine if training impacted overall business goals. The document also reviews other models and emphasizes the importance of evaluating all levels to improve training design and ensure a return on investment.