Poka-Yoke, Wufoo's live preview form alerts you at the beginning that you don't have any fields and adds instructions and an explanation of what the field's purpose is to clear up confusion and to get things rolling for the user. Next to the options tabs to "standard" and "fancy pants" Wufoo has added icons that more easily describe to the user what that tab will do; the "checkboxes" tab shows what the checkbox looks like, this prevents the user from clicking on a tab and realizing it's not the one you want.
Detection Devices, I noticed Wufoo doesn't have a detection for spelling words wrong. I tested this out and there wasn't a feature that detected misspelled words. However it does detect and create an error page- an Application Modal, if you try to save a form with the same name as one that already exists. The error form is nicely written and easy to understand and allows for the user to get back on track by closing out of the form and fixing the error.
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