The purpose of this book is to provide a clear and concise guide to the key elements of constitutional law. thr books in the Cavendish Essential Series are intended as a revision aid for the law student, primarily at the undergraduate level, but they will be helpful to any student studying law as part of their course. Areas covered in this book include: Constitutional law and its Sources; Australian Constitutional History; Outline of the Australian Constitutional System; The Commonwealth Parliament; The Judicial Branch and Separation of Powers; The Executive; State and Territory Constitutional Law; Express and Implied Rights; Interpreting the Commonwealth Constitution; Trade and Commerce; Corporations; External Affairs; Taxation, Grants and Expenditure; Defence; Excise Duties; Freedom of Inter-State Trade, Commerce and Intercourse; Inconsistency; Intergovernmental Immunities. This edition has been updated to include the most recent cases decided by the High Court. Each chapter contains a discussion of the leading cases relevant to the particular topic, as well as a summary of the main points covered in the chapter.