Many countries and regions recognise the relevance of digital research infrastructure (DRI) as fundamental to their research effort, e.g. Australia’s 2021 National Research Infrastructure Roadmap (https://www.education.gov.au/download/13735/2021-national-research-infrastructure-roadmap/26919/2021-national-research-infrastructure-roadmap/pdf, Recommendation 7), or Canada (https://ised-isde.canada.ca/site/digital-research-infrastructure/en). Understanding uptake - by whom, how and for what purposes such infrastructure is used and why it may not be used -  is key for understanding user needs, barriers and opportunities. This understanding can be used to increase uptake, justify existing and to acquire further (sustainability) funding, and to understand how the...