1. UI
   1. Low resolution
   2. High resolution
   3. Different Screen size
2. Functionality
3. API request response
   1. Map local of response
   2. Invalid response from server
   3. Changing attributes for certain api response
   4. Bad request from app
   5. internal server error
4. Upgrade
   1. Upgrade from playstore build
   2. Serial upgrade
   3. Upgrade from old version
5. Backward compatibility
6. GA and localytics
   1. Existing and new
7. Vernac
8. Network
   1. 2G
   2. 3G
   3. Wi-fi
   4. No internet
9. Impact analysis
   1. On new features
   2. Existing features
   3. App performance
10. Cross platform
11. User communication
    1. Email
    2. SmS
    3. Push notif
    4. In app notif
12. Inerruptions and saved states
    1. Suspend
    2. Resume
13. App attributes
    1. Size
    2. Version
    3. Base code