Background: Bereavement support is a core part of palliative care. However, the evidence base is limited by a lack of consistency in the outcomes used to evaluate services and models of support, which makes it difficult to compare approaches. Core Outcome Sets (COS) represent the minimum that should be measured in research into specific conditions or services. The aim of this study was to use a stakeholders' perspective to develop a COS for evaluating bereavement support for adults in adult palliative care settings. Methods: A list of outcomes relevant to bereavement support was created following a systematic review of the quantitative and qualitative literature. At an expert workshop 21 stakeholders discussed their views on the most important outcomes and compared these to and critiqued the lists constructed from the review. These lists and discussions informed a two round international DELPHI survey (n = 240) designed to reach consensus on which outcomes/outcome dimensions should be included in the COS. To prioritise and validate the items emerging from the survey, participants at a subsequent consensus day ranked the relative importance of these items (n = 23). A final feedback exercise with these consensus day participants was conducted to confirm the selection of outcomes and dimensions. Results: 'Ability to cope with grief' and 'Quality of life and mental wellbeing' were selected as two core outcomes. Twenty-one different dimensions to explore when assessing these outcomes were also identified. The coping related dimensions have been categorised as: Negative and overwhelming grief; Communication and connectedness; Understanding, accepting and finding meaning in grief; Finding balance between grief and life going forwards; Accessing appropriate support. Those relating to quality of life and wellbeing have been categorised as; Participation in work and/or regular activities; Relationships and social functioning; Positive mental wellbeing and Negative mental and emotional state.

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Background: Bereavement support is a key component of palliative care, with different types of support recommended according to need. Previous reviews have typically focused on specialised interventions and have not considered more generic forms of support, drawing on different research methodologies. Aim: To review the quantitative and qualitative evidence on the effectiveness and impact of interventions and services providing support for adults bereaved through advanced illness. Design: A mixed-methods systematic review was conducted, with narrative synthesis of quantitative results and thematic synthesis of qualitative results. The review protocol is published in PROSPERO ( www.crd.york.ac.uk/prospero , CRD42016043530). Data sources: The databases MEDLINE, Embase, PsycINFO, CINAHL and Social Policy and Practice were searched from 1990 to March 2019. Studies were included which reported evaluation results of bereavement interventions, following screening by two independent researchers. Study quality was assessed using GATE checklists. Results: A total of 31 studies were included, reporting on bereavement support groups, psychological and counselling interventions and a mix of other forms of support. Improvements in study outcomes were commonly reported, but the quality of the quantitative evidence was generally poor or mixed. Three main impacts were identified in the qualitative evidence, which also varied in quality: ‘loss and grief resolution’, ‘sense of mastery and moving ahead’ and ‘social support’. Conclusion: Conclusions on effectiveness are limited by small sample sizes and heterogeneity in study populations, models of care and outcomes. The qualitative evidence suggests several cross-cutting benefits and helps explain the impact mechanisms and contextual factors that are integral to the support.