Why does it have to be a radio button? Seems like you're describing a
dropdown menu with no selection to start. This is a very common state
on forms for optional elements.

As a voice against pre-selection, I recently had a problem making a
donation to a UN Foundation site. I clicked through from an e-mail
hoping to make a $25 contribution. They offered radio buttons for $10,
$35, $50, $100 and up, plus other. $50 was preseleected.

I took the bait upping the ante and clicked $35 and Donate. Except
with no confirmation message offered, I got a "thank you for your $50
donation." My click hadn't registered, and $50 was charged, which I am
now disputing with a bad taste in my mouth.

Users should have to make a choice unless there's a clear default,
like on a travel site where you are almost always buying 1 adult
ticket or 1 hotel room.

Diana

On Tue, Jun 16, 2009 at 8:53 PM, Emely Serruys<[email protected]> wrote:
> Hi,
>
> I am wondering if it is (already?) acceptable to omit the explicit
> null option in a radio button control?
> I have used radiobuttons for a non-required control. To apply the
> null option the user would have to 'unselect' the one selected
> radio button (this to save place by not adding a fourth radio button
> or to not have to use a drop down control).
> I suppose it is kind of an unusual behavior but it seems to me that
> is is learnable, and I have seen it in product design. Has this kind
> of behavior been introduced in forms before?
>
> Thanks for your opinions,
> Emely
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