Longitudinal datasets that match individual students’ assessment data from two or more points in time allow schools and governments to analyse the extent to which they have effectively raised pupil achievement. By taking students’ prior attainment into account they provide ‘value added’ measures.
Thomas, S.; Massoud SalimEdQual Policy Brief No. 11. Longitudinal datasets in education. EdQual, University of Bristol, Bristol, UK (2011) 4 pp.