If necessary, a heading can accompany a set of Radio Buttons to provide further clarity for the user.
Always use a clear and concise label for Radio Buttons. Be explicit about the action that will follow if the Radio Button is selected. Labels appear to the right of Radio Buttons. Use sentence-style capitalization (only the first word in a phrase and any proper nouns capitalized) and no more than three words.
Users should be able to select the Radio Button by clicking on the box directly or by clicking on its label.
A set of Radio Buttons should default to having one option selected. Never display them without a default selection.