This document provides an overview of writs and judicial review in Sri Lanka. It begins by defining writs as forms of command issued by courts, and lists the main prerogative writs: certiorari, prohibition, mandamus, quo warranto, and habeas corpus. It then discusses the nature and historical development of these prerogative remedies. The document outlines key cases related to writ jurisdiction and judicial review in Sri Lanka. It concludes by explaining the common grounds for judicial review via writ of certiorari: lack of jurisdiction, violating natural justice, errors on the face of the record, and unreasonableness.