If you notice here carefully, you are moving through a different stage of booking a cab, you can move to the next stage only when a certain action is successful in the current stage. Still, you can move back to screen 2 then screen 1, you can move back all the way to the first ever screen. Now say it’s raining heavily & no driver accepts your trip or no available driver is found in your locality to fulfill your trip, so an error message pops up informing you about driver unavailability & you stay on screen 3. Once your trip is confirmed & none of you or your driver cancels the trip, you remain on screen 4, you can’t book any new trip until your current trip ends. Likewise, screen 3 depends on screen 2 & screen 4 depends on screen 3. Screen 2 depends on Screen 1, without providing valid data on screen 1, you can’t move to screen 2. In this use case, screen 1 is independent, it’s the first screen shown to all users. Uber now shows you a map where you can track your driver.Once you select the payment method & press on ‘Confirm’ button with the desired time of travel if required, the trip is confirmed, driver gets assigned.Once the correct destination is found, Uber shows you recommended travel options like Pool, Premier, UberGo, Uber XL etc along with a possible price.You first open the app, home screen appears, you put destination in the search bar.

Let’s consider a very basic real-life use case of booking a cab through Uber:

Easycare easyboot transition