The effects of varied test order within a computer test battery on test performance were investigated. An experiment was performed to determine whether completing objective personality tests sensu R. B. Cattell affects test performance in subsequent cognitive ability tests and vice versa. The sample consisted of managers of an industrial corporation (an automotive supplier) in “higher management positions” (business managers, department chiefs, and team leaders) who attended an investigation of their professional potential that resembled a real selection situation. It was hypothesized that carry-over and priming effects, as well as fatigue and learning effects might occur. Results of a MANOVA showed a main effect of test order on objective personality tests, since “frustration tolerance” decreased and “decisiveness” increased when objective personality tests were presented subsequent to cognitive ability tests, while cognitive ability tests were not affected by prior objective personality tests.