Checkboxes vs. Radio Buttons
Jakob Nielsens Guideline on the correct use of checkboxes and radio buttons. (Ugly website, usefull guideline)
Extract:
Even prominent websites make elementary errors in the use of basic user interface controls. The main guidelines are clear, but there are ten other things you should consider when using checkboxes and radio buttons.
related links:
Alertbox - Checkboxes vs. Radio Buttons
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