'Making Sense of Evidence' The Critical Appraisal Skills Programme (CASP) is part of OAP Ltd, set up by Professor Sir Muir Gray. The Critical Appraisal Skills Programme (CASP), delivers training to help people make sense of scientific literature. The programme has developed workshops and tools for critical appraisal covering a wide range of research. It has also developed finding the evidence workshops, interactive and e-learning resources. CASP offers online learning modules, virtual workshops and face-to-face workshops.