Guideline
• Sort options in a logical order from most likely to least likely to be selected. Top to bottom for vertical list radio, left to right for horizontal list radio.
• Make the first option to be the default select option.
• Labels should be concise and provide clear context. It should be no more than 3 words.
When to use
• When the user has to choose only one option.
When not to use
• When the user is able to choose more than one option. Consider using a checklist.
• When there are 5 or more options. Consider using dropdown for it.