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It is critical to understand that you don’t need to create a prototype for the entire system.  It is very common to prototype a small portion of the user interface, perhaps a single screen or HTML page, before moving on to implementing it. 

You want to stop the UI prototyping process when you find the evaluation process is no longer generating any new ideas or it is generating a small number of not-so-important ideas. Otherwise, back to exploring your stakeholder’s UI needs.

When trying to decide which technique is most appropriate for the situation, one general rule of thumb is that we can best prove something works with live-data prototypes and split testing, but we can best understand why something doesn’t work, and most importantly, what it would take to make it work, with face-to-face user testing.