In the present study, we propose a model describing how motivational beliefs and strategies influence study performance of students at three different school levels: elementary (age 8-10), middle (11-14), and first year high school (15). Participants were administered the AMOS 8-15 instrument (Cornoldi et al. 2005) designed for measuring the influence of motivational beliefs and strategies on recall task performance. Results of multigroup analysis confirmed the relations proposed in our model between motivational beliefs and strategies for all three groups, the largest difference being in how these aspects influenced performance on recall tasks: in elementary and middle school, motivational beliefs have direct influence on performance, whereas in high school they influence performance through strategy use.