Bad Designs, part 16, answers

Discoverability: the ability to look at something and discover what operations one can do.

Examples of discoverability:
a cable port on a computer
a stapler
a tape dispenser
a pepper pot
a typewriter
aeroplane controls
car controls
computer trackpads (an example of where there is no discoverability)
…and doors!

Feedback: a signal of what happened.

Examples of feedback:
a light or sound when you plug the computer cable into the port
a sound or feeling when you use the stapler
a sound when you remove tape from the dispenser
a sound or feeling when you use the pepper pot.

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