Abstract
The article presents a revision of the added value model in school assessment, understood to mean the extent to which the school achieves greater student performance, once other factors have been controlled, such as the socio-cultural context and the initial level of knowledge. Firstly, the evolution of this concept over the last few years is analysed, on account of an advance in three areas: studies on effective schools; performance measures; and changes in educational ideology. In point two there is some reflection on the contributions this model makes towards the most classical assessment approach, but attention is also drawn to the risk which may be run in doing so. Part three presents the assessment and research projects which are conducted by the National Foundation for Educational Research (NFER) within this theoretical framework. Finally, there is an appendix with a guide on taking the necessary decisions for working from the added value approach.
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