One day at the cafeteria Mike turns to Joe and says "my elbow hurts like hell, I think I need to see a doctor".
"Listen, you don't have to spend that kind of money", Joe replies. "There's a diagnostic computer down at Wal-Mart. Just give it a urine sample and the computer will tell you what's wrong and what to do about it. It takes seconds and only costs ten dollars".
Mike deposits a urine sample in a jar and takes it to Wal-Mart. He deposits ten dollars and the computer lights up and asks for the urine sample. He pours the sample into the slot and waits. Ten seconds later the computer ejects a printout: "You have tennis elbow. Soak your arm in warm water and avoid heavy activity. It will improve in two weeks. Thank you for shopping at Wal-Mart".
That evening, thinking about how amazing this new technology is, Mike began to wonder if the computer could be fooled. He mixed some tap water, a stool sample from his dog, urine samples from his wife and daughter, and a sperm sample for good measure. Mike hurried to Wal-Mart, eager to see the results, deposits ten dollars, pours in his concoction, and waits for the results.
The computer ejects the following printout:
1. Your tap water is too hard. Get a water softener. Aisle 9.
2. Your dog has ringworm. Bathe him with anti-fungal shampoo. Aisle 7.
3. Your daughter has a cocaine habit. Get her into rehab.
4. Your wife is pregnant with twins. They aren't yours. Get a lawyer.
5. If you don't stop playing with yourself, your elbow will never get better.
"Listen, you don't have to spend that kind of money", Joe replies. "There's a diagnostic computer down at Wal-Mart. Just give it a urine sample and the computer will tell you what's wrong and what to do about it. It takes seconds and only costs ten dollars".
Mike deposits a urine sample in a jar and takes it to Wal-Mart. He deposits ten dollars and the computer lights up and asks for the urine sample. He pours the sample into the slot and waits. Ten seconds later the computer ejects a printout: "You have tennis elbow. Soak your arm in warm water and avoid heavy activity. It will improve in two weeks. Thank you for shopping at Wal-Mart".
That evening, thinking about how amazing this new technology is, Mike began to wonder if the computer could be fooled. He mixed some tap water, a stool sample from his dog, urine samples from his wife and daughter, and a sperm sample for good measure. Mike hurried to Wal-Mart, eager to see the results, deposits ten dollars, pours in his concoction, and waits for the results.
The computer ejects the following printout:
1. Your tap water is too hard. Get a water softener. Aisle 9.
2. Your dog has ringworm. Bathe him with anti-fungal shampoo. Aisle 7.
3. Your daughter has a cocaine habit. Get her into rehab.
4. Your wife is pregnant with twins. They aren't yours. Get a lawyer.
5. If you don't stop playing with yourself, your elbow will never get better.
~Accepting design works~ 
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