While it may seem like the four-level evaluation model has been around forever, this now-standard method of evaluation wasn't introduced until 1959 in a series of four articles published in ASTD's Training and Development Journal. Despite the current popularity of this model, many new and seasoned practitioners still question how to use the four levels: What are the four levels? What resources are necessary, and do I have them available? Which programs should be evaluated, and at which level? This Infoline takes the classic Kirkpatrick model and synthesizes it for the busy trainer.