This book covers details of various grey-based models and methodologies and the practical applications of the same, with specific focus on the management and the social sciences domains. The step-by-step implementation aspects, which is followed in this book help readers to implement the methodologies with ease. Undergraduate and postgraduate students of business management and social sciences domains can be benefited through the practical and case-based approach charted in the book. Also, the Excel-based implementation aspects with screenshots of the calculations and the formulas, along with the downloadable Excel files can help the users to replicate the results as given. Apart from this, the implementation aspects can assist them in advocating these methodologies to diverse research problems. A wide variety of applications of the grey system-based methods, such as the grey relational analysis, grey prediction, grey clustering, grey programming, grey target decision-making, grey incidence analysis, and other combined grey-based models are elaborated and detailed in this book.