Glossary of terms used on this site

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a term used particularly in relation to the performance of schools for a measurable impact on pupil attainment which is more than that statistically expected. In other words it appears that the school has improved its learners' levels of attainment more than that of other schools. However without very detailed knowledge of the nature of school composition - the socioeconomic background of learners -  and their out-of-school experiences it is by no means easy to attribute causes for such phenomena.