Imagine a form with a list of items (facilities - toilets, showers, etc.) where for each of them user can select whether the item exists (Yes), doesn't exist (No) or it's not known whether it exists (Not known). What would be the best way to present this to the user?
I'm looking for a solution that is graphically pleasing, intuitive and user friendly. My initial idea was to simulate a three-position switch with labels above to indicate the selection. I will appreciate links to existing solutions or simply verbal ideas.
Based on your suggestions, I've decided for the following design. Thank you all for your answers.