Level 1: Reaction (End of course rating sheets, "smile sheets")
Level 2: Learning (Testing to determine successful completion of the program or learning of a body of knowledge)
Level 3: Performance (When employees return to the workplace, have they improved on what they do? are they re-trained on a change? does their work improve? do they work faster? etc.)
Level 4: Results (ROI, increased sales, decreased expenses, a reduction of error costs? etc.)
*Donald L. Kirkpatrick, Evaluating Training Programs: The Four Levels. San Francisco: Berrett-Koehler, 1998