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Teachers' and students' roles in formative assessment

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Assessment for Learning

What gains did the students make and how were they measured?

The researchers analysed test data from 25 classes containing pupils who, with their teachers, were participating in formative assessment activities. By comparing the performance of each class with that of a similar class which had not undergone the intervention they sought to measure the effects of the intervention on students' academic achievement. Rather than introducing a new testing regime, the researchers used results from national tests at key stage 3, GCSE examinations and internal school examinations for their analysis. They found that:

  • in all but four classes there was a positive affect on attainment (overall mean effect size of 0.32);
  • the four classes showing negative effects were all mathematics classes; and
  • the greater the extent to which the teachers embedded their strategies into their practice the more consistent were the gains in attainment;

The researchers were very cautious in their claims about the effect of the intervention on attainment, not least because of the difficulty of ensuring robust comparisons. The most reliable form of comparison was between the attainment of the intervention class and that of a parallel class taught by the same teacher the previous year, but it was not always possible to achieve this. In a number of cases the researchers made comparisons with parallel classes taught by the same teacher in that year with the inherent risk that the teacher's involvement in the project spread to influence the comparison class as well. Overall the researchers predicted that improvements of the order of half a GCSE grade per subject are achievable.