This book gives a detailed account of the current state of the law concerning good faith in contractual performance in Australia, through an empirical study on its reception and development across the various Australian jurisdictions. In Australia, good faith received wide attention after Priestly J introduced in his obiter comments in Renard Construction (ME) v Minister for Works (1992) 26 NSWLR 234.This book focuses on the attitude of the judges to good faith, the definition of good faith, and the possibility of legislating a good faith obligation in Australian contract law. This book also discusses the issues surrounding its development, its meaning, and acceptance at the international level.The empirical legal research adopted in this book will offer a significant contribution in understanding the concept of good faith in Australia from the empirical perspective.