This substantially revised text provides a comprehensive, highly accessible, and student friendly introduction to the principles, concepts, and methods currently used in educational research. This text provides a balanced combination of quantitative and qualitative methods and enables students to master skills in reading, understanding, critiquing, and conducting research. The treatment of qualitative research is parallel to that of quantitative research to enable students to better understand all approaches to research. This text uses extensive examples from different journals, thoughtful pedagogy that includes instructional aids, instructional tests, key terms, application problems, concept maps, criteria for evaluating studies, and MyEducationalResearchLab, a new interactive website.