Background: Professional development (PD) in a range of occupations has become increasingly digitised. Numerous digital courses are available, with evidence that social media, blogs and apps are increasingly being used for PD. Yet despite clear benefits, there is little robust evidence on the characteristics of digital PD that impact positively on…

In this study, we analyzed usages behaviors of 53,825 active users from 12 countries in a mobile app called "English Practice." The data indicated that the app was used most often in the evening from 8 p.m. to 9 p.m., and especially midweek, with less use at weekends and on Mondays. Learners used the app for about 5 minutes each session…