Justice has to do with punishment and reward, and also with equality, but how should we define it? ‘Justice’ examines what justice really means and what principles we apply to decide when outcomes are fair. One principle of just distribution is equality, and some political philosophers have claimed that it is the only principle — all justice is a kind of equality. However, need and desert give us two very basic reasons why justice can require us to treat people differently. One good reason for not treating people in the same way is that they have different needs. Doing justice is a complex matter, and what counts as giving someone his or her due is to a large extent contextually determined.