The Fourth Edition of Introduction to Educational Research by Craig A. Mertler guides readers through the steps of the research process to help them plan and execute research projects in educational settings. With balanced coverage of qualitative and quantitative methods, an emphasis on ethics, and concrete applications of methods, this text offers a practical presentation of the research process. New to the Fourth Edition are more information on interviews throughout the book, expanded coverage of qualitative research, and a thoroughly updated chapter on action research. Three current research articles are included as appendices to demonstrate qualitative, quantitative, and mixed methods. Comprehensive and student-friendly, Introduction to Educational Research uses conversational and nontechnical language to help students clearly understand and apply research concepts, principles, procedures, and terminology.