Background: Public research funding agencies and research organisations are increasingly accountable for the wider impacts of the research they support. While research impact assessment (RIA) frameworks and tools exist, little is known and shared of how these organisations implement RIA activities in practice. Methods: We conducted a review of academic literature to search for research organisations' published experiences of RIAs. We followed this with semi-structured interviews from a convenience sample (n = 7) of representatives of four research organisations deploying strategies to support and assess research impact. Results: We found only five studies reporting empirical evidence on how research organisations put RIA principles into practice. From our interviews, we observed a disconnect between published RIA frameworks and tools, and the realities of organisational practices, which tended not to be reported. We observed varying maturity and readiness with respect to organisations' structural set ups for conducting RIAs, particularly relating to leadership, skills for evaluation and automating RIA data collection. Key processes for RIA included efforts to engage researcher communities to articulate and plan for impact, using a diversity of methods, frameworks and indicators, and supporting a learning approach. We observed outcomes of RIAs as having supported a dialogue to orient research to impact, underpinned shared learning from analyses of research, and provided evidence of the value of research in different domains and to different audiences. Conclusions: Putting RIA principles and frameworks into practice is still in early stages for research organisations. We recommend that organisations (1) get set up by considering upfront the resources, time and leadership required to embed impact strategies throughout the organisation and wider research 'ecosystem', and develop methodical approaches to assessing impact; (2) work together by engaging researcher communities and wider stakeholders as a core part of impact pathway planning and subsequent assessment; and (3) recognise the benefits that RIA can bring about as a means to improve mutual understanding of the research process between different actors with an interest in research.

BACKGROUND: The mechanisms and pathways to impacts from public health research in the UK have not been widely studied. Through the lens of one funder (NIHR), our aims are to map the diversity of public health research, in terms of funding mechanisms, disciplinary contributions, and public health impacts, identify examples of impacts, and pathways to impact that existing reporting mechanisms may not otherwise have captured, and provide illustrations of how public health researchers perceive the generation of non-academic impact from their work. METHODS: A total of 1386 projects were identified as 'public health research' by the NIHR and listed in the NIHR Public Health Overview database (2000-2016). From these, a subset of 857 projects were matched as potentially having begun reporting impacts via an external data-gathering platform (Researchfish). Data on the 857 projects were analyzed quantitatively, and nine projects were selected to investigate further through semi-structured interviews with principal investigators. Two workshops took place to validate emerging and final findings and facilitate analysis. RESULTS: In addition to the NIHR School for Public Health Research and the NIHR Public Health Research Programme, 89% of projects contained in the NIHR Public Health Overview portfolio as 'public health research' are funded via other NIHR research programmes, suggesting significant diversity in disciplines contributing to public health research and outcomes. The pathways to impact observed in our in-depth case studies include contributing to debates on what constitutes appropriate evidence for national policy change, acknowledging local 'unintended' impacts, building trusted relationships with stakeholders across health and non-health sectors and actors, collaborating with local authorities, and using non-academic dissemination channels. CONCLUSIONS: Public health as a discipline contributes substantially to impact beyond academia. To support the diversity of these impacts, we need to recognise localized smaller-scale impacts, and the difference in types of evidence required for community and local authority-based impacts. This will also require building capacity and resources to enable impact to take place from public health research. Finally, support is required for engagement with local authorities and working with non-health sectors that contribute to health outcomes.