What happened, and who cared? Evidencing research impact retrospectively.

Higher Education Institutions in the UK and elsewhere are under increasing pressure to measure the impact of their research, which can include how the research has increased scientific engagement amongst the general public. For various reasons, the need for evidence can arise months, or even years, after a particular research discovery has been made. Furthermore, the right kind of evidence is needed to indicate genuine behavioural change amongst a given target audience, which can be difficult to obtain after time has passed. In this article, we present a number of strategies for retrospective evidencing of research engagement, and illustrate their use on example discoveries from up to five years ago.