A timely update to a timeless model. Don Kirkpatrick's groundbreaking Four Levels of Training Evaluation is the most widely used training evaluation model in the world. Ask any group of trainers whether they rely on the model's four levels Reaction, Learning, Behavior, and Results in their practice, and you'll get an enthusiastic affirmation. But how many variations of Kirkpatrick are in use today? And what number of misassumptions and faulty practices...