This book provides a study on the relevance of good faith obligation with a specific focus on Australia and China. Good faith has been hailed as one of the most important unresolved contractual issues in contract law. There have been numerous judicial approaches over the years to articulate a baseline for good faith application; however, the direction taken in dealing with this important issue is generally unsatisfactory, both in producing a coherent understanding of the role and sustaining a uniform application of good faith in contracts. This book concentrates on examining whether the continued relevance of good faith in arm length contractual relationships based on the reasonable expectations of the contracting parties can be maintained. To accomplish this, good faith is examined by revisiting the legal approaches from a comparative perspective in understanding whether there is a continuing role for good faith in commercial contracts.