What is the purpose of a critical appraisal?

Introduction: Set the context and signpost the reader:  Aim of the assignment is to…….  A critical appraisal of…  The paper are you addressing…  The CASP framework are you using… Next paragraph: Establish the context for the critical appraisal:  What is evidence based practice – define this. Why is it important in health care?  What is a critical appraisal?  What is the purpose of a critical appraisal?  What is the purpose of a critical appraisal framework?  What three overarching questions does the CASP first question ask that you consider?  State that the critical appraisal of Paper A / B will follow the ten questions that form the CASP framework.