Investigating how to measure mobile user engagement

User Engagement is a keyword employed by software companies, researchers, and developers designing user-centred applications. Indeed, designing digital experiences to engage users is a goal that is becoming increasingly important for several disciplines such as education, marketing, information systems, and much more. Since opinions concerning the definition of user engagement greatly vary, the question comes up whether it is possible to provide a universal set of metrics to equally measure the engagement in any kind of application and in mobile applications in particular. Starting from results in the literature, this paper provides a simple definition of user engagement and a related set of metrics. Such metrics will be evaluated in a pilot study with more than 300 teenagers in four European countries