Not all evidence can be trusted and knowing how to critically appraise it for yourself is vitally important.
Introduction to Critical Appraisal Videos 1 - 3 examine 10 principles that can be applied when critically appraising literature .
Critical appraisal - Part 1 (YouTube, 3m19s) explains why this process is necessary.
Critical Appraisal - Part 2 (YouTube, 12m9s) examines 1 to 5 of the 10 principles.
Critical Appraisal - Part 3 (YouTube, 5m45s) examines 6 to 10 of the 10 principles.
Look at these readings to learn more about appraisal: