My part of the "Digital Science Webinar: Articulating Research Impact – Strategies from Around the Globe" (http://www.digital-science.com/events/digital-science-webinar-articulating-research-impact-strategies-from-around-the-globe/) Daniel S. Katz will discuss how reviewers at the National Science Foundation (USA) consider the “intellectual merit” and “broader impacts” criteria for funding and in particular how metrics might help applicants understand their impacts in these areas.Dan will also talk about how reviewers might use qualitative and quantitative altmetrics data to inform their peer reviews for grant applications. He will address many of the salient questions around this use of metrics, for example, do reviewers take metrics seriously and what types of metrics are of most value to them?