The purpose of the Handbook of Special Education is to help profile and bring greater clarity to the already sprawling and continuously expanding field of special education. To ensure consistency across the volume, chapter authors review and integrate existing research, identify strengths and weaknesses, note gaps in the literature, and discuss implications for practice and future research. The second edition has been fully updated throughout to take into account recent changes to federal laws as well as the most current academic research, and an entirely new section has been added on research methods in special education.