What is the most accurate way to evaluate a training program?

A) use only a pretest
B) conduct pretests, train only part of the employees, then compare the trained employees to the untrained
C) conduct pretests and posttests on all untrained employees
D) use only a posttest
E) check trainees' performance, knowledge, and attitudes only after they have completed the training program

Conducting pretests, training only part of the employees, and then comparing the trained employees to the untrained ones allows for a controlled comparison that can accurately measure the effectiveness of the training program. This method, often referred to as a control group study, helps isolate the impact of the training by comparing outcomes between those who received the training and those who did not.