There are various critical appraisal tools available free and online. As already noted, these checklists and worksheets can vary according to the type or study or research that is being appraised.
This Critical Appraisal Tools pathway is an interactive site where you can select lists of tools according to the sort of assistance you need, and the study type to be appraised.
Understanding Health Research: A Tool for Making Sense of Health Studies "is a tool designed to help people understand and review published health research to decide how dependable and relevant a piece of research is". The Review a Study module guides you through a series of questions about a piece of research you have found, and helps you to evaluate the quality of the research.
CASP is best known for its checklists, a set of eight critical appraisal tools designed to be used when reading research. These eight tools match eight different study or research types.
This highlights that the checklist you use should depend on the type of study you are appraising.
The checklists are free to download, and can be used by anyone under the Creative Commons licence.
Special Note: Don't confuse Critical Appraisal Tools with Critically Appraised Topics. Both have the same acronym (CATs).
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