Grocery Self-Checkout Redesign
A Hierarchical Task Analysis was developed to break down all tasks required by the user to purchase groceries using a self-checkout system.
The task analysis was used to locate problems and inefficiencies with the current system. Low-fidelity paper prototypes were developed to address these issues for a simple use case, and were later tested to determine the effectiveness of the improvements.
Initial screen presented to the user with a clearly marked option to begin the checkout process.
Main screen the user interacts with during the checkout process. It contains an up to date list of all inputted items, with an image area that displays the most recently added item. The user is able interact with this list to show the item's image, remove it from the list, or edit its quantity. Additionally, there is a clearly marked button allowing them to move on to the payment stage.
Guard put into place to alert users if they have scanned the same item multiple times. This can be used to prevent accidentally overcharging the customer, or as a shortcut to enter a large number of the same item without having to scan it repeatedly.
If the user chose to search for an item, they would be presented with a similar set of screens. The above series of screens demonstrate the path a user would follow to find strawberries.
After the user has chosen to confirm and pay, they are brought to a confirmation page to verify the items, and their prices.
After the user has confirmed the contents of the list are correct, they are brought to this page allowing them to input the number of bags used. During research, this was found to be a critical requirement for a self-checkout system, since law requires that a fee be associated with the purchase of plastic bags.
After specifying the number of bags, the user is able to choose a method of payment, each with an informative label and icon.
