• Steven Woolf, Holger J Schünemann, Martin P Eccles, Jeremy M Grimshaw, and Paul Shekelle.
• Department of Family Medicine and Center on Human Needs, Virginia Commonwealth University, Richmond, VA, USA.
• Implement Sci. 2012 Jan 1; 7: 61.

AbstractClinical practice guidelines are one of the foundations of efforts to improve healthcare. In 1999, we authored a paper about methods to develop guidelines. Since it was published, the methods of guideline development have progressed both in terms of methods and necessary procedures and the context for guideline development has changed with the emergence of guideline clearinghouses and large scale guideline production organisations (such as the UK National Institute for Health and Clinical Excellence). It therefore seems timely to, in a series of three articles, update and extend our earlier paper. In this second paper, we discuss issues of identifying and synthesizing evidence: deciding what type of evidence and outcomes to include in guidelines; integrating values into a guideline; incorporating economic considerations; synthesis, grading, and presentation of evidence; and moving from evidence to recommendations.

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