Explain Mock-Up versus Proof of Concept

I recently joined a project and they are working on a proof of concept in order to see if it meets the client's needs. But how far does a Proof of Concept need to go?

How much of it can be faked and how much needs to be real logic/data? I know that depends on the situation.

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I think as long as your clients can understand the intent behind the design of the application and the intended usage of it, faking the data should be fine.

To me a mock-up is something like a photo of how the application is supposed to look rather than a tangible application. A proof-of-concept is a written application that is boilerplate for the most part that will allow the users to experience how it's used.

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