Table 2 Synopsis of derived features, clustered in Scrum-like epics and user stories
Epic | Example user story (as a user) | Functional requirement | Source | |
|---|---|---|---|---|
Front-end | ||||
Content management | I want to see information about the local spread of the virus inside the app | Information on the regional infection situation | ||
Content management | I want to have some basic information about contact with an infected person, as far as location and time are concerned | Information about contact cased | [29], our first survey results | |
Content management | I want to be able to learn the current best practice behavior inside the app | Education and health literacy | Pritlove and Mayer ([43]; E1) | |
Cluster and event recognition | I want to document my participation at an event (with given privacy) | Crowd and event notification | ||
Cluster and event recognition | I want to know upfront when I enter a crowd and post when I have been in a potential cluster | Cluster recognition | ||
Cluster and event recognition | I want to be warned in situations with many people | Crowd sensitivity | Kriehn ([29]; E7) | |
COVID-19 test result report | After quarantine, I want to clean up my positive test result | Clean up test results after infection | Our first survey results | |
Diary | I want to document my symptoms inside the app and report them | Tracking of own symptoms | Köver and Beckedahl ([28]; E6) | |
Diary | I want to do a daily write-up of all situations of the day, in which I was close or even too close to other people | Contact diary | ||
Regular use | I want to configure what happens in an automated detected or manual parametrized at-work mode | At-work mode | Kriehn ([29]; E5) | |
User experience | I want to have a reason to use/open the app (e.g., daily) | Gamification | Pritlove and Mayer [43] | |
User experience | I want the app to better display what data is being used and how it is being collected. This would greatly increase awareness of when data is being sent | Privacy concerns | Our first survey results | |
Vaccination | I would like to get vaccinated and document the vaccination date and location | Vaccination | (E4) | |
Back end | ||||
COVID-19 test result report | I want to receive my test result via the app, regardless of where I took the test | Connecting labs | Köver and Beckedahl [28]; our first survey results) | |
Regular use | I want the app to update more often | Update more regularly | Our first survey results | |
Parameterization | I want to understand the risk calculation of the app to estimate my risk status | Ongoing modification of risk score calculation | [58] | |
Parameterization | I want the app to distinguish between indoor and outdoor contact situations | Indoor versus outdoor | Pritlove and Mayer [43] | |
Accessibility | I want to use the app when abroad, and I want foreign visitors to use their local app with a connection to the same warning server | Cross-border functionality within Europe | Whitelaw et al. [57], E1, our first survey results | |
Accessibility | Users with an old/no smartphone: I also want to participate in the CWA approach | Compatibility with older smartphone/offering separate technologies | ||