Lifespan human development is the study of all aspects of biological, physical, cognitive, socioemotional, and contextual development from conception to the end of life. In approximately 800 signed articles by experts from a wide diversity of fields, The SAGE Encyclopedia of Lifespan Human Development explores all individual and situational factors related to human development across the lifespan. Some of the broad thematic areas will include: Adolescence and Emerging Adulthood Aging Behavioral and Developmental Disorders Cognitive Development Community and Culture Early and Middle Childhood Education through the Lifespan Genetics and Biology Gender and Sexuality Life Events Mental Health through the Lifespan Research Methods in Lifespan Development Speech and Language Across the Lifespan Theories and Models of Development. This five-volume encyclopedia promises to be an authoritative, discipline-defining work for students and researchers seeking to become familiar with various approaches, theories, and empirical findings about human development broadly construed, as well as past and current research.