Chapter 4. Anticipating and Planning for Downstream Consequences
If you spend time in a hospital or other health care facility, you will probably encounter a crash cart—a mobile cart that holds critical medications and supplies for emergencies. Crash carts are designed for convenience and speed. In an emergency, a nurse or another medical professional can quickly grab whatever they need from a crash cart to help patients.
One manufacturer of crash carts, who shall remain nameless, realized that its products needed some sort of security so passersby couldn’t just walk off with drugs or other medical supplies. So, it designed a locking mechanism that required users to authenticate before they could access the contents. Also, someone at the company decided that the best way to authenticate was by thumbprint so doctors and nurses wouldn’t have to remember passwords or PINs. The manufacturer therefore added a thumbprint reader to the cart design.
Now, imagine that you are a nurse frantically tending to an emergency patient with a gunshot wound to the chest. Every second counts as you rush to save their life. The patient needs an injection of epinephrine immediately from the crash cart, so you place your thumb on the reader, and…nothing happens. Because you are wearing medical gloves. Which are covered in blood. Thumbprint readers can be great for security, but in this case, their inclusion caused downstream consequences that weren’t anticipated by the designer.
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