And I seem to recall that the old radios on which the metaphor is based could 
be pushed half in. That would cause all buttons to pop out thus having *no* 
selection. Not saying that as a justification for having no selection in a 
radio group. Just pointing out that the metaphor wears a bit thin ;)


On 08/06/2010, at 11:38 AM, Ben Buchanan wrote:

> On 7 June 2010 14:58, Steve Gibbings <> wrote:
> I have a problem with that.   Radio button sets should always have an option 
> selected, there is no undefined selection.  This makes sense when you 
> remember where the radio button metaphor came from. However seems that 
> doesn't get universally implemented.
> Technically correct, true. Would you recommend a checkbox instead, or some 
> other option?
> In practice I think the usage of radio buttons has shifted to accommodate 
> sets with no initial selection. In usability terms it's probably better than 
> a dropdown for a yes/no; and some people do have some issues with the implied 
> off state of checkboxes. Compare it with a paper form where you have two 
> boxes and you tick or cross an option - there's no preselection. I guess it 
> depends which paradigm is more likely to fit the scenario.
> cheers,
> Ben
> -- 
> --- <>
> --- The future has arrived; it's just not 
> --- evenly distributed. - William Gibson
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