When should I use Radio Buttons?

Question

IMHO Radio buttons should retire. The ComboBox (Drop-Down list mode) should always be preferred.
Drop-Down list takes minimal screen space, and you can add/remove items programmatically.
No need to resize anything (hard), or disable irrelevant options (ugly).

Can you think of a situation when a Radio button is still useful?

Answer 1

Radio buttons should be used:

• When you need to use standard visual representation
• When you need to visually present groups of choices as groups
• When you need to present all choices together (in terms of accessibility)

Generally, according Jakob Nielsen's guidelines, you should prefer usage of radio buttons to comboboxes, which are much less accessible to distinctive clear.

Answer 2

When there is a limited number of options, radio buttons are usually preferred. Things like choosing your sex where there'll only be two options in the foreseeable future, I much prefer radio buttons since it's quick for you to see your options.

In most other cases, I agree, dropdowns are to be preferred.