There's also the SoylentNews approach, based on the Slashdot approach. Positive scores are capped at +5, negative scores are capped at -1 (iirc), a reason must

There's also the SoylentNews approach, based on the Slashdot approach. Positive scores are capped at +5, negative scores are capped at -1 (iirc), a reason must always be selected for a positive vote (e.g. Insightful) or a negative vote (e.g. Flamebait), and you also have the option of neutral votes (+0 Agree and -0 Disagree).