Accounting is the language of business, increasingly standardized across the world through powerful global corporations: a technical skill used to reach the correct, unquestionable answer. Yet, as recent corporate scandals have shown, a whole range of financial professionals (auditors, bankers, analysts, company directors) can collectively fail to question dubious actions. How can this be possible? To understand such failures, this book explores how accountants construct the technical knowledge they deem relevant to decision-making. In doing so, it not only offers a new way to understand deviance and scandals, but also suggests a reappraisal of accounting knowledge which has important implications for everyday commercial life. The book's findings are based on interviews with chartered accountants working in the largest accountancy practices in London. The interviews reveal that although accounting decisions seem clear after they have been made, the process of making them is contested