Selection: the process of choosing amount individuals who have been recruited to fill existing/ projected job openings. The people that are hired are the ones that are going to be creating strategic plans/ implementing them, thus this determines organizational performance. High turn over rates is costly to the organization. Failure of doing the selection process in a adequate manner may cause legal implications. Differential validity: confirmation that the selection tool accurately predicts the performance of all possible employee subgroups. Criterion related validity: extent to which a selection tool predicts or correlates with important elements of work behavior. Content validity: extent to which a selection took adequate samples the knowledge and skills needed to perform the job. Construct validity: extent to which a selection tool measures a theoretical construct or trait deemed necessary to perform the job: tests of cognitive abilities. Intelligence tests: tests that measures general intellectual abilities.