This report provides a comprehensive analysis of organizational behaviour, focusing on leadership styles, motivational theories, and teamwork within British Gas and EDF Energy. It explores various leadership styles, including opportunistic, transformational, and democratic approaches, and their impact on employee motivation. The report compares organizational theories, such as the Neo-classical theory, and management approaches, including scientific management and human relations, adopted by the two companies. It further examines the impacts of different leadership styles on employee motivation and compares motivational theories like Maslow's Hierarchy of Needs. Additionally, the report investigates group behaviour, factors influencing effective teamwork, and the technological impact on both organizations, offering valuable insights into their operational dynamics and management strategies.