Conduct a post-test
This is to understand the impact of the intervention you are evaluating. It is important to think about the timing of your post-test. You should think about how long it is likely to take for the intervention to have an effect on children’s attainment and ensure that you conduct your post-test after this time. You could also conduct one post-test at the end of the intervention and an additional post-test a period of time after that to see whether the effect lasts (e.g. does the impact sustain after one year?).
You should ensure you conduct your post-test:
- At the same time (or time of year if you are using a prior year as a comparison) for both the comparison and intervention group; and
- At a time when as many of the pupils as possible will be there to ensure you have a large sample for the analysis.
The timing of post-tests is important. Read about how this primary school adapted their schedule to fit in a post-test in a busy term.
Finally, when conducting a post-test which involves some teacher judgement you should consider to what extent the assessment outcomes could be influenced by the expectations or desires of the assessor and think about how to ensure the results are ‘blinded’. More information on the importance of blinding in assessments can be found here.