Lehmann, Roxane L.Center for Applied Research and Educational Improvement2007-09-102007-09-102002https://hdl.handle.net/11299/1480Paper prepared for AERA Annual Meeting 2002.This study conducted in a field context at the middle-school level investigated the effects of task differentiation and the task assignment process on the co-variance of effort and achievement outcome and the differential emphasis that students place on ability and effort in explaining the causes of their achievement.en-USstudent achievementReport