Until humans learn how to command machines with their minds (or vice versa), we're always going to need some sort of menu, control panel or whatever to interact with our machines and tell them to do our jobs for us. And these controls had better be really freaking clear, and simple, and easy to use. A speedometer doesn't do any good if, say, it's mounted inside the glove box and requires you to do calculus to read it.
Yet in the real world, you run into interfaces that are almost that bad. The consequences range from minor workplace annoyances, like charging a custumer for a Happy Meal instead of a Big Mac because the buttons are right next to each other, to huge disasters like ...
6The USS Vincennes Shot Down a Civilian Plane Because of Bad Cursors
Toward the end of the Iran-Iraq war in 1988, the United States and Iran had a bit of an undeclared war on the side, presumably just to make Iraq jealous. The most tragic event of this undeclared war happened when the USS Vincennes was in the middle of a confrontation with Iranian gunboats in the Persian Gulf and accidentally shot down a civilian airliner after mistaking it for a combat aircraft in attack mode.
If you're wondering why their radar system didn't have some kind of method for separating friendly planes from hostile, well ...
The Dumb Problem:
Actually, it was equipped with exactly that sort of thing -- the problem was that it sucked.
That's the interface from 1988, apparently being operated by a 15-year-old boy.
Have you ever played a war strategy game on the PC? An RTS game like StarCraft or Red Alert? In those games, you have your little tank or robot icon on the screen, and you click it with your cursor to highlight it. Then from there you can either control the unit or learn more about it (how much health it has left, or whatever).
"Fueled up and ready to g- *mute*"
Well, the U.S. Navy's system was not that sophisticated.
The screen showed the operator what objects were detected on radar, and if he clicked on an object, it would track it. But if the operator wanted to get more information about the object (in this case, by listening in on its radio signals) to find out what it actually was, he had to move a separate cursor and click on the object again.
"In order to see what direction the object is moving, you'll need a soldering gun."
It's clumsy and unintuitive, and it made it really easy to forget which thing they were highlighting at any given moment -- the operator can be tracking one object and have it display the information for a completely different one because he forgot to move the other cursor. It's the kind of user interface that wouldn't make it out of the testing phase of a cheap browser game. And it cost the passengers of the plane their lives.
That's because the operator in the USS Vincennes thought he was listening to the incoming aircraft (the Airbus full of innocent people), because that's the thing he selected, when he was actually receiving signals from a parked F-14 several miles away, because that's where his other cursor was.
"Patch v1.4 fixed a bug that occasionally leads to missiles being fired at planes full of innocent people."
Granted, the transmissions alone wouldn't be reason enough to shoot down a plane: They'd also have to think that it was moving like an enemy aircraft. Unfortunately, the stupid system made that mistake pretty easy, too. Instead of telling the operators at the Vincennes if the approaching plane was ascending or descending, the system just showed them the present altitude on a smaller monitor. The operator had to write down or memorize the altitude, wait a few seconds, then ask again and mentally compare the two results to see if the aircraft was going up or going down.
Because of this, a calculation error led an operator to report that the Airbus was descending toward the USS Vincennes, like a combat aircraft would, when it was probably getting the hell away from them as fast as possible.