1. American Society for Training and Development (ASTD). (no date). Percent of courses evaluated at Kirkpatrick levels [online]. Available: http://www.astd.org/who/research/benchmar/96stats/graph15.gif [March 30, 1998].
2. Dick, W., & Carey, L. (1989).The systematic design of instruction (3rd ed.). Glenview, IL: Scott Foresman & Co.
3. Drucker, P.F. (1993)Post-capitalist society. New York: HarperBusiness.
4. Foshay, R. (in press). An examination of evaluation research.
5. Gilbert, T., & Gilbert, M. (1989: January). Performance engineering: Making human productivity a science.Performance Improvement.