Affordances - the interactions we encounter and have learnt to interact with the and understand their expected behaviour e.g Turn the latch or key to lock the door, it will make a locking sounds and the door will be locked. Human behaviour/ mental model - behaviours which are instinctive and have developed into a known routine which is difficult to change e.g trying the door after it's locked to reassure yourself.

Is this door locked? [picture]
....I have no idea! I hope yes, but I don't trust it! I turn the latch, it makes a locking sounds, I try the door & it opens! I'm presuming it's for fire reasons but when you're in a hotel room alone you never quite trust that some random will walk in!

Worst. Nights. Sleep. Ever!

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