The aim of the review described in this report was to survey the available literature in order to examine critically the claim that the peer-delivered approach is a more appropriate and effective method of promoting young people's health than more traditional approaches. The review looks across health topics; maps the available literature on peer-delivered health promotion; contains a methodological appraisal of the quality of studies which evaluate interventions; and identifies a number of recommendations which might usefully inform future research and practice in this area. A novel feature of the review, compared to others in the series, is that we have attempted a critical appraisal of studies describing processes involved in implementinginterventions, as well as those designed to assess their impact on the target population.