Level3 - Indicator Passive warning devices that caution you to perform correctly. Devices that detect a problem after the process but before exposure to the customer

Level2 - Control Active warning of the problem as it is occurring during the process . Requires a human response to be effective.

Level1 - Guarantee Problem prevented from ever occurring at its source

There are three levels. Mistake Proofing - Specify the mistake-Proofing Level(out of three levels from above) of the following with explanation:

1)Interlocked circuits that automatically lock the car when you change to drive.

2)Automatic sinks in public facilities so the water cannot be left on when someone walks away from it.

3)Auto shut-off irons so we cannot make the mistake of leaving the iron on all day.

4)Traffic Lights on intersections so cars would not crash into each other.

5)Pause-and-serve coffee makers so the coffee stops brewing when the pot is removed.

6)Circuit breakers that trip when they are overloaded.

7)Three-prong outlets so we cannot make the mistake of wrong polarity.

8)Alarms in cars that warn that you left the keys in the ignition.