Final answer:
The primary disadvantage of using concurrent validation is that current employees may not be representative of new applicants.
Step-by-step explanation:
The primary disadvantage of using concurrent validation is that current employees may not be representative of new applicants.
Concurrent validation is a method used in employee selection where the test is administered to current employees as well as new applicants. The results of the test for the current employees are then compared to their actual job performance. However, this method assumes that the current employees are a good representation of the new applicants in terms of their abilities, skills, and job performance. If the current employees do not accurately represent the new applicants, then the test results may not be reliable for predicting the job performance of the new applicants.