The nature of reasonableness review in administrative law has long been obscured behind vivid but uninformative descriptions. In recent years, courts and commentators have recognised that reasonableness review involves assessment of the weight and balance of reasons bearing on a decision. Yet by itself this idea is substantially incomplete, for there are many ways in which issues of weight might be relevant. Drawing on the theory of practical reason, this article offers a new account of the reasonableness standard that explains precisely how the weight of reasons matters. It shows, negatively, that several existing accounts are mistaken. Positively, it proposes that reasonableness be understood as a requirement of ‘relativised justification’: a decision must be justified relative to some eligible understanding of the balance of reasons. This account explains the standard's central features and yields a coherent, workable test for courts to apply.

中文翻译：

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是什么使行政决定不合理？

长期以来，行政法中的合理性审查的性质一直被生动而又缺乏信息性的描述所掩盖。近年来，法院和评论员已经认识到，合理性审查包括评估与决定有关的原因的重要性和平衡性。然而，就其本身而言，这个想法基本上是不完整的，因为在许多方面重量问题可能是相关的。本文基于实践理性理论，提供了对合理性标准的新解释，该标准准确地解释了理性的重要性是如何重要的。不利的是，它表明几个现有帐户有误。积极地，它建议将合理性理解为“相关理由的要求”：必须相对于某种合理的理由平衡理解来做​​出合理的决定。