What is the most accurate, but most costly way to evaluate a training program? Multiple choice question. conduct an in-depth posttest to see if trainees have reached a specified level of competency. conduct both a pretest and a posttest on all trainees to compare their performance observe employees on the job to see if they are able to apply the skills they have learned measuring all employees, training only some of them, and then comparing the results of the trained group with the untrained group