In 2000 Professor David Jesson authored a study that compared results at GCSE with the comparative key stage 2 (KS2) primary school data from 1995. The analysis showed a value added score of +5.4 for specialist schools compared with −1.1 for non-specialist schools. For the first time, there was evidence that specialist status was linked to higher results at GCSE, whether it was on the 5+ A*-C measure, value-added or contextual value added. Schools began to make extensive use of the data themselves to evaluate their performance. The study became an annual project and is still provided today, known as Educational Outcomes.