The document provides an overview of the history and scope of psychology. It discusses how psychology originated from the work of philosophers like Wilhelm Wundt in the late 1800s. It then describes some of the major developments in psychology's evolution including behaviorism, humanistic psychology, and cognitive psychology. The document also outlines psychology's main levels of analysis using a biopsychosocial approach and lists some of psychology's main subfields including clinical, cognitive, and social psychology.