Between ambition and evidence

Measuring impact may be challenging, but does that mean we should accept a lack of ambition? Researchers in all fields are grappling with the challenge of how to measure impact (in many different contexts, which naturally leads to many different approaches), and so perhaps it is not surprising that the ‘impact culture’ is spreading to public engagement. But is the field rising to the challenge or should we think more broadly about how we demonstrate impact, perhaps freeing individual and smaller projects from the need to measure public impact and allowing them instead to focus on formative development? This editorial explores some of the issues in the field