IN ALMOST EVERY program, multiple influences drive the business measures. With multiple influences, measuring the effect of the LD program on the business measure is imperative. Without this isolation step, program success will come into question. The results will be overstated if it is suggested that all the change in the business impact measure is attributed to the program. When this issue is ignored, the impact study is considered inconclusive. Evaluators, therefore, face tremendous pressure to show the actual value of their programs when compared to other factors. To emphasize the importance of this issue, a few facts need to be explored.