The document traces the evolution of organization theory from the late 19th century to present. Early theories focused on efficiency and treated organizations as closed systems. Contributors included Taylor's scientific management and Weber's bureaucracy. Later, human relations and behavioral approaches emphasized social aspects and informal relations. Contemporary approaches view organizations as open systems contingent on factors like technology, size, and environment. Theories are classified along two dimensions: rational/social and closed/open system perspectives. Current organization theory integrates multiple influences on organizational design and effectiveness.