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This might be a technical question or maybe there's a better way of approaching the area but what is the best interaction for asking users to select either an unknown or the specific items. enter image description here

marked as duplicate by Shreyas Tripathy, Devin, locationunknown, RobbyReindeer, Mayo May 2 '18 at 14:17

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"asking users to select either an unknown or the specific items". If I understood correctly the case, you can be literal with the question you want to ask:

mockup

download bmml source – Wireframes created with Balsamiq Mockups

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I think what you describe is similar to "None of the above". If by "Either" you mean the user selection of something in the form is mandatory, I would be fine with something like the following, where selecting the last option deselects everything above it. From what i've seen and implemented, this feels natural and even appears often in governmental paper forms.

mockup

download bmml source – Wireframes created with Balsamiq Mockups

However, without knowing your use case better, I can't help but think that if the user has Item 1 but the second item is of unknown type, there is no option in that form that satisfies the user's needs.

  • Thanks, that's actually very useful and even the placement of the unknown as last seems a logical change, allowing the user to see all options before deciding none are relevant. – Eliot Hill Dec 6 '16 at 14:06
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You might found anwer in this post : Using mixed radio and checkbox buttons - is there any efficiency or usability gain in the design? with Design B recommendation. Two step form can improve comprehension.

  • I think it's a bit different as there aren't multiple radio buttons here. – ecc Dec 6 '16 at 13:00
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    How are you going to deselect a single radio button without breaking the radio button metaphor? – SteveD Dec 6 '16 at 14:52

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