But the process should not be confused with science. When tests are used as selections devices, they're not a neutral tool; . For one thing, the tests tend to screen out - or repel - those who would upset the correlation. If a man can't get into the company in the first place because he isn't the company type, he can't very well get to be an executive and be tested in a study to find out what kind if profile subsequent executives should match. Long before personality tests were invented, of course, plenty of companies proved that if you only hire people of a certain type, then all your successful men will be people of that type. But no one confused this with the immutable laws of science.