**Maîtriser le diagnostic financier** is a practical French-language guide to assessing the financial condition and performance of a business. The title indicates a focus on financial diagnosis: reading accounts, interpreting key indicators, and using financial data to understand profitability, liquidity, solvency, and operational stability. Aimed at readers who need a structured approach to corporate financial analysis, it is suitable for students, managers, accountants, and professionals working with financial statements. The book appears to offer methodological support for turning accounting information into clear business insight. Rather than treating financial figures as isolated data, it emphasizes how to connect balance-sheet and income-statement information to broader questions about risk, efficiency, and decision-making. Its professional orientation suggests an emphasis on usable techniques for evaluating company health and supporting informed financial judgment.