How a court responds to an ouster clause or other attempts to curb its jurisdiction, which seeks to exclude or limit judicial review over a public law dispute, is a reflection of the judicial perception of its role within a specific constitutional order. Article 4 of the Singapore Constitution declares the supremacy of constitutional law over all other forms of law—whether statutory, common law or customary in origin. The courts have judicially declared various unwritten constitutional principles which are of particular relevance to the question of the scope of judicial review, particularly, the separation of powers and the rule of law.With comparative references where illuminating, this article examines the scope of judicial review in Singapore administrative law, in the face of legislative intent that it be partially truncated or wholly excluded, with a view to identifying and evaluating the factors_x000D_ that have been judicially considered relevant in ascertaining the legitimacy of an ouster clause,_x000D_ including the Article 93 judicial power clauses and the inter-play of other constitutional principles.