The use of trustworthy and rigorous research methods is foundational to advancing the science of industrial and organizational psychology and its practice in the field. Understanding this, the authors have paired straightforward, plainly written explanations in a conversational tone with illuminating diagrams and illustrations. Many descriptions are followed by in-depth demonstrations and examples from relevant software, including SPSS, R, and even Excel when it’s the best option available. Insightful and accessible, the text covers the full gamut of I-O research methods, from theory to practice and everywhere between. Paired with a detailed instructor’s manual, this book serves as a gentle but thorough introduction to the complex world of research methods in I-O psychology for both master’s and Ph.D. students, as well as researchers, academics, and practitioners.