a set of instructions that achieves an objective

adding a few blocks of code at a time and testing the program

the view seen by the end user

data bases and user data

an action that occurs during the running of an app that triggers a response by the software

an event that is triggered by the user interaction

a set of instructions that achieves an objective

where the code is processed

When back button is clicked, user is sent back to Screen 1.

When back button is clicked, the measles player and meningitis player continue playing.

When the back button is clicked, both players stop playing before the user is sent back to Screen 1.

When back button is clicked, the players are paused and then the user is sent back to Screen 1.