We present a theory explaining the impact of ability tracking on academic performance based on grading policies. Our model distinguishes between initial ability, which is mainly determined by parental background, and eagerness to learn. We show that achievements of low ability students may be higher in a comprehensive school system, even if there…

Describes a study that investigated the effects of promising pupils that a letter would be sent to their parents if they showed "good" progress in English comprehension. Results indicated a larger significant increase in scores for those pupils who had been promised a letter to their parents than for those who had not been given this promise. (NRJ)