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