Principles of Contract Law, 6th edition, remains Australia's premier text for students of contract law. The new edition has been substantially revised and updated, including the following:

• the discussion of part performance has been rewritten in light of Pipikos v Trayans [2018] HCA 39;
• the estoppel chapter has been substantially rewritten to provide readers with a clear understanding of the range of different views as to the current state of promissory estoppel in Australian law;
• the restitution chapter has been extensively revised, particularly in light of Mann v Paterson Constructions Pty Ltd [2019] HCA 32;
• the construction chapter has been substantially expanded to provide more detailed coverage of the courts' general approach to construction, the evidence that may be taken into account (including more detailed discussion of particular categories of extrinsic evidence), the role of contractual purposes and absurdity;
• in the implied terms chapter, implication for business efficacy and terms implied in law are discussed in greater detail;
• in the restrictions on termination chapter, the sections on the readiness and willingness requirement and relief against forfeiture have been expanded and made clearer;
• the penalties chapter has been revised to accommodate the developments in Paciocco v Australia and New Zealand Banking Group Ltd [2016] HCA 28; (2016) 258 CLR 525;
• the mistake chapter has been substantially rewritten and made clearer throughout;
• the duress chapter has been revised to capture the key distinction between unlawful and lawful act duress;
• the undue influence chapter has been updated in the light of Thorne v Kennedy [2017] HCA 49; (2017) 263 CLR 85;
• and the chapter on statutory unconscionable conduct has been revised to take account of ASIC v Kobelt [2019] HCA 18.