This book provides a comprehensive and systematic assessment of the application of Simpson's diversity index to the workplace. It offers human resources practitioners and researchers in the nonprofit, private, and public sectors a hands-on guide on how to measure and analyze demographic and organizational diversity with the Simpson diversity index. Examples of the application of the diversity index to employment data are provided throughout the book, while the text also illustrates the use of ordinary least squares, robust, Tobit, and ridge regression methods to assess how organizational and workplace factors influence age, ethnic, gender, and organizational diversity.