Case Study 3: Security
A large, fast-food chain unveiled a new touch screen register for its franchises.
Each cashier was assigned a user id and password combination to log in to the
register. The system allowed the incorrect password to be entered four (4) times
before the register would lock and require a manager to unlock it with a key card.
To prevent unauthorized access, the registers would lock after three (3) minutes
if the screen was not touched. When the register locked, only the cashier who
was logged in prior to it locking could unlock it without a system restart.
After a few days in operation, restaurant managers started complaining about the
amount of time they were spending unlocking the registers. Some cashiers were
forgetting their user Id and password, so other cashiers would log in for them. It
also seemed that the button layout made it easy for the cashiers to key in the
incorrect password. The managers also complained that cashiers would leave for
a break or end their shift and forget to log out of the locked register. The
managers would have to reboot the system, a three to five (3-5) minute process
in order for the next cashier to log in. Additionally, managers noticed that grease
was building up on the touch screens, making them less responsive.
Write a five to eight (5-8) page paper in which you:
1. Analyze the new system and determine the design issues
with this new system.
2. Describe how you would correct the design issues with the
system to make the restaurant managers happy.
3. Create a design plan that:
1. Lists and explains the tasks associated with improving this
2. Contains at least six (6) tasks.
3. Includes realistic time estimates for each task to be
4. Analyzes the development of the system in your plan.
5. Analyzes the testing of the system in your plan.
6. Analyzes the implementation of the system in your plan.
4. Examine how this system balanced security and usability,
and explain the challenges of incorporating system security
and system usability into a design.