The COMET Handbook: Version 1.0

Paula R Williamson, Douglas G Altman, Jane Blazeby, Sara Brookes, Elizabeth Gargon, Nicola Harman, Jamie J Kirkham, Angus McNair, Jochen Schmitt, Caroline Terwee, Bridget Young

Research output: Contribution to journalArticle (Academic Journal)peer-review

533 Citations (Scopus)
262 Downloads (Pure)


The selection of appropriate outcomes is crucial when designing clinical trials in order to compare the effects of different interventions directly. For the findings to influence policy and practice, the outcomes need to be relevant and important to key stakeholders including patients and the public, health care professionals and others making decisions about health care. It is now widely acknowledged that insufficient attention has been paid to the choice of outcomes measured in clinical trials. Researchers are increasingly addressing this issue through the development and use of a core outcome set, an agreed standardised collection of outcomes which should be measured and reported, as a minimum, in all trials for a specific clinical area.

Accumulating work in this area has identified the need for guidance on the development, implementation, evaluation and updating of core outcome sets. This Handbook, developed by the COMET Initiative, brings together current thinking and methodological research regarding those issues. We recommend a four-step process to develop a core outcome set. The aim is to update the contents of the Handbook as further research is identified.
Original languageEnglish
Article number280
Number of pages50
Volume18(Suppl 3)
Publication statusPublished - 20 Jun 2017

Structured keywords

  • Centre for Surgical Research


  • Core outcome set
  • COMET initiative
  • Patients and the public


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