Students who score high in achievement needs tend to make higher grades in college than those who score low. When degree aptitude for college work, as indicated by College Entrance Examination Board Tests, is held constant, engineering students who score high in achievement needs tend to make higher grades in college than the aptitude test scores would indicate. We can define this need as the habitual desire to do useful work well. It is a salient influence characteristic of those who need little supervision. Their desire for accomplishment is a stronger motivation than any stimulation the supervisor can provide. Individuals who function in terms, of this drive do not "bluff" in regard to a job that they fail to do well. Some employees have a strong drive for success in their work; others are satisfied when they make a living. Those who want to feel that they are successful have high aspiration for themselves. Thoughts concerning the achievement drive are often prominent in the evaluations made by the typical employment interviewer who interviews college seniors for executive training. He wants to find out whether the senior has a strong drive to get ahead or merely to hold a job. Research indicates that some who do get ahead have an even stronger drive to avoid failure. What is the main subject of this passage