Impact assessment research has developed theory-based approaches to trace the societal impact of scientific research. Impact assessment typically starts from the perspective of a research investment, organization, or project. Research users, non-academic actors involved in knowledge production, translation, and application, are well represented in…

Assessing societal impacts of research is more difficult than assessing advances in knowledge. Methods to evaluate research impact on policy processes and outcomes are especially underdeveloped, and are needed to optimize the influence of research on policy for addressing complex issues such as chronic diseases. Contribution analysis (CA), a…

Bibliometrics is successful in measuring impact because the target is clearly defined: the publishing scientist who is still active and working. Thus, citations are a target-oriented metric which measures impact on science. In contrast, societal impact measurements based on altmetrics are as a rule intended to measure impact in a broad sense on…