In Pearson, A., Field, J., & Jordan, Z. (2009). Evidence-based clinical practice in nursing and health care: assimilating research, experience and expertise. Appendix 2. Located in the Health Sciences Library RT42 .P43 2007
GRADE provides guidance for rating the quality of evidence and the strength of recommendations in health care. A series of articles describing the GRADE approach were published in the Journal of Clinical Epidemiology (2011, Vol 64, Issue 4).
A few resources that may be helpful in learning how to critically appraise an article are listed below.
JAMAEvidence "helps decision makers identify the best available evidence by providing guides to the systematic consideration of the validity, importance, and applicability of claims about the assessment of health problems and the outcomes of health care."