Students’ effective motivation is an important requirement from modern education. The main objective of the survey is to examine the motivation of 10–14-year-old students participating in differentiated development. We hypothesize that the motivation to maintain high levels of employment differentiation promotes more efficient and effective knowledge acquirement. Sample: 5-8 classes, examining a total of 354 (177 experimental and 177 control group) students. Method: Using the longitudinal method I followed up how the motivation of students brought under a pilot group and developed in a differentiated way is changing for four academic years. I also measured the motivation of a control group where no differentiated development was carried out. The motivation was measured by the Kozéki-Entwistle learning motivation questionnaire. Results: Results show that in the pilot group there was a considerable positive change in all the three important motive groups (follower, inquirer, performer), while the control group did not produce the same. The efficient learning was advanced considerably by the high level of motivation in the pilot group. Discussion: Differentiated development has got a positive impact on learning motivation.