Objectives
The main aim of the impact evaluation was to determine the effect of the P4C programme on the Key
Stage 2 scores of pupils who were in Year 5 when the schools were randomised and Year 6 by the
end of the trial. A further outcome was the scores on the CAT4 (Cognitive Ability Test, Fourth Edition;
GL Assessment website) for those in Years 4 and 5 at the start and in Years 5 and 6 when posttested.
A subsequent aim proposed by the developers and agreed by the funders was to consider the
short-term impact of P4C on pupils’ experiences at school, and their relationship with teachers and
peers.
The process evaluation was designed to assess fidelity to treatment and to collect the views of
teachers, school staff members, and pupils regarding P4C impact and implementation.