A practical guide that defines and quantifies “quality” in businesses—consistent profitability, efficient use of capital, stable earnings, strong balance sheets and shareholder-oriented management—and explains how to measure these traits (including useful accounting adjustments), combine them with valuation and portfolio construction, and implement factor-based strategies; the book blends empirical evidence, case studies and actionable tools to show how focusing on high-quality companies can improve risk-adjusted returns and provide downside protection for long-term investors.