** the flow of data between the UI screens and data stores such as database and Android file system

** the flow of data between the UI screens and Web API servers (URLs) or other devices, if applicable

**Note: If your project is UI-intensive, you are expected to apply Material Design Guidelines or Android design patterns as much as possible. If your project is data-intensive (e.g. use of database and graphics)or back-end intensive (e.g. use of networking and Wifi connectivity), you may apply Material Design guidelines or Android design patterns at the minimum.

** '''Android design patterns: interaction design solutions for developers''' by Greg Nudelman. Wiley, 2013. (available as ebook at Seneca Libraries)

*** Material Design (Android Developer website) [https://developer.android.com/design/material/index.html]

*** Google Design Guidelines - Material Design [http://www.google.com/design/spec/material-design/introduction.html]