The publication of Political Liberalismhas allowed John Rawls to bring to the fore issues that remained in the background of A Theory of Justice. His explicit attention to the concept of ‘the reasonable’ is a welcome development. In a more recent publication, he affirms the importance of this concept, ‘while [granting] that the idea of the reasonable needs a more thorough examination than Political Liberalism offers.’ In this paper, I will present a critical exposition of the senses of the reasonable (...) on which justice as fairness relies. Rawls employs the term in four main contexts. I will outline these various senses and argue that in each case, a controversy in the secondary literature can be resolved by close attention to the concept of the reasonable. In three of these contexts, Rawls relies on what I will call a ‘strong’ sense of the reasonable, while in one he sometimes seems to rely on a ‘weak’ sense. I argue that justice as fairness is best served by relying on a strong sense throughout. (shrink)