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So long as you are confident you abide by any relevant laws and consumer rights then you can design the PoS how you like, but having designed a UI for large PoS systems, I know it's a real nightmare area for legal requirements. Under some (probably many) laws, the consumer must be able to see clear details of the price being charged for each item, along ...


2

Definitely stick to the users knowledge. The brain makes connections when we learn something. There is sometimes no need to reinventing the wheel. If it's a simple feature, stick the basic principles. Humans learn from repeating actions a lot or making connections from something they know. People use schemata to store information, if you change the schemata, ...


2

I don't think it's an either/or question. By all means introduce new features, but give the user feedback about what's happening. For instance, I recently designed a survey where the user just had to select their answer, and it would advance to the next question. The question advancing gave the user feedback that their answer had been accepted, and they ...


1

One way to attempt to measure this is to consider the return on investment. If a new system is more efficient, but the increase in efficiency is outweighed by the extra time needed to learn the new system, the time spent learning it can be a net loss. For instance, if a sign up form is designed that, once learned, is more efficient than a more conventional ...



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