Longitudinal changes in pupils' academic self-perception (as measured by Myself-As-a-Learner Scale [MALS]) were investigated between Year 6 and Year 10. The possibility of there being gender and attainment differences was also explored. There was a significant drop in mean MALS scores between Years 6 and 7. There was a further drop between Years 7 and 8 but this was small and not statistically significant. MALS scores remained largely stable between Years 7 and 10. Girls scored lower than boys on this measure and this difference reached significance in the Years 6 to 7 data. The results showed that higher attaining pupils (as measured by the Key Stage 2 levels in English, Maths and Science) had higher average MALS scores. Implications for the standardisation arrangements of the MALS test are discussed, with particular reference to the desirability to include norms to incorporate attainment, age and sex.