A bad example of mental model or visibility. Android back button. Sometimes it takes you to the main app screen, sometimes it takes you to the previous app. S

A bad example of mental model or visibility. Android back button. Sometimes it takes you to the main app screen, sometimes it takes you to the previous app. Same with multitasking. Sometimes the task will run in the background. Sometimes it will be killed. Not fun if you keep thinking that im app is still online...