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PCB checklist for buttons/switches

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5upercircuits:
I'm creating a public PCB design checklist (https://murphymeter.com/checklists/checks/2/0/). The scope is consumer products.

What would you put into a checklist regarding buttons and switches?
So far I have:
- Contact bouncing
- You should label what it's used for
- Operating life

What else? How about contact oxidation? Mechanical stability? How do you check this, or more precise what are counter measures?

Is contact oxidation really a problem for consumer products? Maybe if you live close to the shore or in a humid area?

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