Table 2.

App aspects used in our user reviews classification (adapted from Haggag et al. 2021 and Huebner et al. 2018)

App Aspect	A user review containing...
Privacy	... privacy or security related issues, e.g collecting or accessing
	users data, information, location, etc.
Stability	... stability or failure related issues, e.g. crashes, freezes, bugs, etc.
Advertising	... ads or commercials related issues, e.g frequent ad banners,
	pop-ups, etc.
Requests	... user requests related issues, e.g. feature, bug fix, app updates
	requests, etc.
Uninstallation	... users deleting or uninstalling the app because of privacy, stability issues, etc.
Payments	... billing or subscriptions related issues, e.g in-app purchases, premium upgrades, etc
Compatibility	... OS or HW related issues, e.g. unsupported versions, OS requirements,
	unsupported external devices, etc.
Resources	... resources related issues, e.g. battery drainage, memory usage, etc.
Connectivity	... connectivity or networks related issues, e.g. Bluetooth, 3G,
	4G, WiFi, NFC, etc.
Account and	... accounts or logging related issues,
Logging	e.g. sign up, login, logout , etc.
Resources	... resources related issues, e.g. battery drainage, memory usage, etc.
Notification	... notifications or alerts related issues, e.g. too frequent or few
	alerts, notifications, etc.
Updates	... app updates related issues, e.g. bugs or software issues after
	updates, etc.
Internationalisation	... internationalisation related issues, e.g. language, culture,
	countries, etc.