title: A realist synthesis of the evidence on outreach programmes for health improvement of Traveller Communities.
abstract: Improving the health of Traveller Communities is an international public health concern but there is little evidence on effective interventions. This study aimed to explain how, for whom and in what circumstances outreach works in Traveller Communities.
  
  
  
  A realist synthesis was undertaken. Systematic literature searches were conducted between August and November 2011. Grey literature was sought and key stakeholders were involved throughout the review process. Iterative steps of data extraction, analysis and synthesis, followed by additional searches were undertaken.
  
  
  
  An explanatory framework details how, why and in what circumstances participation, behaviour change or social capital development happened. The trust status of outreach workers is an important context of outreach interventions, in conjunction with their ability to negotiate the intervention focus. The higher the outreach worker's trust status, the lower the imperative that they negotiate the intervention focus. A 'menu' of reasoning mechanisms is presented, leading to key engagement outcomes.
  
  
  
  Adopting a realist analysis, this study offers a framework with explanatory purchase as to the potential of outreach to improve health in marginalized groups.
authors.affiliation: Department of Public Health and Wellbeing, Faculty of Health and Life Sciences, Northumbria University, Coach Lane Campus East (H012), Newcastle upon Tyne NE7 7XA, UK Fuse, the Centre for Translational Research in Public Health, UK.
authors.forename: M
authors.initials: M
authors.lastname: Lhussier
authors.affiliation: Department of Public Health and Wellbeing, Faculty of Health and Life Sciences, Northumbria University, Coach Lane Campus East (H012), Newcastle upon Tyne NE7 7XA, UK Fuse, the Centre for Translational Research in Public Health, UK Faculty of Health, Federation University, Australia.
authors.forename: S M
authors.initials: SM
authors.lastname: Carr
authors.affiliation: Department of Public Health and Wellbeing, Faculty of Health and Life Sciences, Northumbria University, Coach Lane Campus East (H012), Newcastle upon Tyne NE7 7XA, UK Fuse, the Centre for Translational Research in Public Health, UK.
authors.forename: N
authors.initials: N
authors.lastname: Forster
mesh_terms: D003159:Community-Institutional Relations; D006293:Health Promotion; D006304:Health Status; D006801:Humans; D015397:Program Evaluation; D006178:Romani People / Q000706:statistics & numerical data
keywords: health promotion; population-based and preventative services; relationships