Chapter 4. What do you test, and when do you test it?

Why the hardest part is starting early enough

Wait until next week.We’ll have a better sketch on a bigger napkin.

—WHAT MY CLIENTS ALWAYS SAY WHENI TELL THEM I WANT TO SEE THE DESIGNTHEY’VE SKETCHED ON A NAPKIN

It’s not hard to understand: If you’re going to watch people try using what you’re building, you have to have something for them to use. This means you have to decide what you’re going to be testing each month.

People tend to think that you can’t start testing until you have something that actually works—if not the finished product, then at least a functioning prototype.

But if there’s one thing that usability professionals agree on, it’s that you want to start testing as early as ...

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