The following video (3 mins, 59 secs.) helps to clarify the process of critical appraisal, how to systematically examine research, e.g. using checklists; the variety of tools /checklists available, and guidance on identifying the type of research you are faced with (so you can select the most appropriate appraisal tool).
The following video (4 min. 58 sec.) introduces the use of CASP checklists, specifically for critical appraisal of a randomised controlled trial (RCT) study paper; how the checklist is structured, and how to effectively use it.
The following video is a recording of a webinar, with facilitator and participants using a CASP checklist, to critically appraise a randomised controlled trial paper, and determine whether it constitutes good practice.
The following videos (all approx. 2-7 mins.) focus on a particular aspects of critical appraisal methodology for quantitative studies.