Use Case: After adding some burgers and fries (Birdie Tots) to the cart, the user goes to the cart screen to submit the order. At this point, the user decides to add more fries, but doesn’t understand how to do that.
Problem: The cart interface presents several usability issues. The item quantity display doesn't appear clickable, yet reveals editing options when tapped. The "Add more" button has ambiguous meaning - users cannot determine if it adds more of the same product or new items to the cart. These design inconsistencies introduce uncertainty into what should be a straightforward item quantity editing process, unnecessarily increasing the user's cognitive load during checkout.
Annotated screencast:
Wolt
Wolt
Best Practice: In the Uber Eats app, can easily manage their cart with prominently displayed buttons for adjusting the quantity of items. Additionally, a clearly visible trash bin icon offers a straightforward way to remove any dish from the cart.
Uber Eats
Original screencast: