Book: Evaluating
Training Programs: The Four Levels.
Donald L. Kirkpatrick. This is THE definitive text on evaluation and
training ROI. If you only read one book on the subject, pick this
one.
Book:
Another Look at Evaluating Training ProgramsThis book,
published by the American Society for Training & Development, is a
compilation of all evaluation articles published from 1987 to 1998 in
Training & Development. Dr. Donald Kirkpatrick deems these fifty
articles "best practices."
Kirkpatrick's Four Levels of Training Effectiveness