• Each possible world-state has a value
• The value of a world-state is determined by the amount of value for the individuals in it
• The function that determines the value of a world state is monotonic in its arguments (we often, but not always, require linearity as well)
• The function that determines the value of a world state does not depend on the order of its arguments (a world where you are happy and I am sad is the same as one where I am happy and you are sad)
• The rightness of actions is determined wholey by the value of their (expected) consequences.

and then either

• An action is right iff no other action has better (expected) consequences

or

• An action is right in proportion to to the goodness of its consequences