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Prototyping helps you test and validate your designs early
so that you can refine or even rethink your ideas and avoid costly mistakes further down the road.
*Paper prototypes* are the fastest and cheapest way to get ideas out of your head and into users' hands.
While digital versions might look more pleasing,
you can create multiple versions on paper within a fraction of the time it takes to create a single one digitally.
Paper prototypes also make it simple to conduct a Wizard of Oz session

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where you swap out elements to simulate interactions.
Once you test and weigh your options, you can proceed to the digital version with the shortlisted option.
If assembling paper prototypes feels cumbersome,
you can take pictures of your paper wireframes
and turn them into digital prototypes that users can use on real devices.
Turning sketches into prototypes is as easy as taking a picture with
your smartphone and linking different screens.
You can use dedicated prototyping tools or even regular presentation tools

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to create a digital prototype from hand-drawn wireframes.
The digitized paper prototype will be easier to handle for you and your users
while still giving you the speed and flexibility of sketching.