Functional specifications of the app

To fulfill the preceding requirements from your client, you will have to develop the following features:

• A welcome, or splash, screen
• A screen from which the user can log in to the app using Facebook
• A screen upon which the user can create poll and enter poll details and options
• A screen upon which the user can see all of the polls created by others
• A screen upon which the user can respond to the poll by selecting one of the poll responses
• The ability to delete previously created polls
• A screen to display responses to the poll that the user created

The preceding features can be represented in a use case diagram, as follows: