The human relations movement stemmed from the Hawthorne Studies in the 1920s-1930s. The studies found that social and psychological factors strongly influence worker productivity and satisfaction. They determined that informal work groups and manager attention impact workers more than physical conditions alone. This led to new approaches focusing on human aspects of organizations and applying behavioral sciences to management. Theories like Maslow's hierarchy of needs and McGregor's Theory X/Y helped explain worker motivation. Pioneers like Follett and Mayo emphasized social processes, cooperation, and treating workers with dignity.