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Depending on the stage of the design process and the goals of the prototype, select the appropriate fidelity for each of the following: The quickest way to start prototyping is also the easiest: putting pen(cil) to paper.
Sketching on paper is a low-fidelity approach that anyone can do; no special tools or experience required.
Rapid prototyping helps teams experiment with multiple approaches and ideas, it facilitates discussion through visuals instead of words, it ensures that everyone shares a common understanding, and it reduces risk and avoids missed requirements, leading to a better design faster.
Lying at the low-fidelity end of the prototyping spectrum, paper prototypes are static and usually have low visual and content fidelity.