Act – JJC Smart. Approach sums up likely benefits and harms for each act. Easy to rationalize, difficult to apply, potentially erratic (Mill: ‘Godless expediency’).
Rule – Richard Brandt. Rule-based approach follows rules (of thumb?) established in advance (e.g. stealing usually doesn’t have the best consequences) Quicker, less erratic, might not be responsive to circumstances.
Preference/pluralist - Peter Singer - evaluate consequences in terms of various goods, not just hedonism: virtue, knowledge, pleasure, life, and freedom, or animal desires.