I thought clear labels were enough until I watched my mom try to book a hotel in Tampa
She tapped the button marked "Continue" three times and nothing happened, because the real submit button was a tiny gray arrow next to it. Now I run every form past someone who has never seen it before I ship it. What's the worst hidden button you've run into?
Last month at a gas station in Ohio, I stood there poking a screen for a good two minutes before some kid showed me the real pump start button was a tiny unmarked square on the side. Here's the thing though, I don't think testing on fresh eyes catches everything, because a person who has never seen your form will just ask you for help instead of quitting like a real user would. The hard part is watching someone struggle without saying a word, and most of us can't do that.