The leave procedure is used primarily by lawyers and the courts as a necessary first step to obtaining judicial review of government acts. It is, therefore, in the forefront of the regulation of public officials that touches the social, economic and political well-being of the people. The procedure for instituting judicial review actions under Order 16 of the National Court Rules, however, is a relatively new field of legal practice in Papua New Guinea. The novelty as well as the technical nature of this procedure presents many problems to judges and legal practitioners. This book addresses these problems and provides a critical insight into the judicial review process. Most importantly, it offers a practical guide to judges and lawyers. It is an important and unique contribution to the legal literature of Papua New Guinea, which should impact positively on advocacy and fairness in the judicial system.