You didn't specify how the user selects a preferred contact method.
Supposing it's a checkbox:

Preferred contact method: 
[X] Phone [phone number input]
[  ] Email [email input field]

Suppose the phone input field gets a red outline when the checkbox is
chosen - and stays there until the field is filled or checkbox
cleared?

I'll bet The appearance of the field would feel a bit more like a
guide, not just a warning. And perhaps it would drive users to fill
in the field right away, eliminating errors rather than capturing
them before submitting.




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Posted from the new ixda.org
http://www.ixda.org/discuss?post=37204


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