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List options in a logical order:
Most likely to least likely to be selected.
Simplest to most complex operation.
Make the most likely or convenient radio button option the default.
If you need to have an unselected state, add a radio button with a None option.
If you can't have a comprehensive list of all possible options, add an Other option.
Use a radio button when the options being presented are important enough to occupy more screen space.
Do not use a radio button if:
You need to offer the user the option of multiple selection. In this case, use checkboxes instead because radio buttons are for single-selection contexts only.
You need to present more than 8 options. Use a dropdown menu.
The default option is recommended for most users in most situations. In this case, consider a dropdown list instead, which uses less space by not showing all options straightaway.
In special cases, there are only two mutually exclusive options. Combine them into a single checkbox or toggle switch. For example, use a checkbox for “I agree” (for example, to terms and conditions) instead of two radio buttons for “I agree” and “I don’t agree”.
The options are numbers with fixed steps. Use a slider.
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