All Research is Not Created Equally: Assessing the quality of program evaluation studies
Critical Appraisal of Research Evidence
A Guide from the Ontario Public Health Libraries Association
"The purpose of this guide is to provide a brief overview of the critical appraisal process. Assessing the validity of research studies can be a complex and time-consuming undertaking. If you are conducting a lengthy evaluation, you may wish to consult more exhaustive critical appraisal resources (a list of suggested further reading has been appended to this guide). Participation in the Skills Enhancement for Public Health program offered by the Public Health Agency of Canada is recommended prior to attempting in-depth critical appraisal."