Emerging researchers are often surprised to learn that instrument selection is a complex and important step in the process of research design. This concise guide explains how to identify appropriate instruments, select the best ones for the job, and properly describe the instruments so that others will know how and why they were chosen. Each chapter in the book focuses on a specific aspect of instrument selection, with illuminating examples and helpful worksheets to fill out along the way. Part of APA's Concise Guides to Conducting Behavioral, Health, and Social Science Research series, this book is aimed at undergraduate students in research methods courses or others with a lab or research project.