Competition or Cooperation? : Using push notifications to increase user engagement in a gamified smartphone application for reducing personal CO2-emissions

Abstract: A helpful tool in forming, breaking, and maintaining habits and behaviors is a digital behavior change intervention (DBCI). These are interventions that leverage digital technologies to help their users to either take on or avoid certain behaviors. A common problem is a lack of user engagement with the interventions’ content, which is key for its effectiveness. It has however been shown that gamified content and using prompts—such as push notifications—may have the effect of increasing user engagement, for both DBCIs and other applications. Furthermore, two commonly occurring game concepts are competition and cooperation, each with different influences on engagement which in turn may vary depending on the context and the user. Therefore, this thesis set out to examine how push notifications can be used to increase user engagement with a gamified DBCI by making its gamified elements more salient. Additionally, it will investigate if there is any difference in influence on engagement of notifications that either promote competition or cooperation. This was evaluated by deploying two different push notification strategies on Deedster—a gamified mobile DBCI with the aim to get its users to reduce their personal CO2-emissions—and tracking user behavior. The results of the evaluation showed that users who received push notifications were more engaged—started more sessions and spent more time—with the application than users who did not receive any. They also performed a significantly higher amount of target behaviors. There was no difference in the influence on performed target behaviors between the notifications promoting competition or cooperation, and only one significant difference—usage of intervention features—regarding user engagement. The gender of the user was also found to be a considerable factor in the influence of the push notifications. Competition increased engagement more than cooperation for male users, but not for female users.