We are a centre currently doing OCR 21C and have had a go at all of the three types of controlled assessment. We are somewhat dissatisfied with the experience and are wondering whether the controlled assessment systems for the other courses might better suit our needs. We have already decided to move to one of the Certificate/IGCSE courses for the top 40% or so of our cohort. The remainder will then do Core and Additional Science. It would be really useful to know the experiences of other centres who do controlled assessment for AQA, Gateway or Edexcel. If the controlled assessment with these courses is more fit for purpose it might be worth the work required to change. Thanks in advance.