Book excerpt: This book is the leading account of contract law in England and Wales in relation to implied terms. Implied terms are not only frequently of great importance in litigation, but can assist business parties in planning contracts effectively by allowing them to identify issues over which they do not need to negotiate because they would be content with the terms the law would imply. Distinct commercial advantages of this approach can include savings of management time in negotiating and avoiding trade-off costs demanded by counterparties in exchange for agreeing an express term.