This report provides a comprehensive analysis of organizational behaviour, exploring various leadership theories, including behavioral, great man, and trait theories, and their impact on organizational effectiveness. It evaluates different managerial styles, such as Likert's styles, and their influence on employee motivation and organizational outcomes. The report also examines motivational theories like Maslow's hierarchy of needs and Herzberg's two-factor theory, highlighting their role in enhancing employee engagement. Furthermore, it delves into theories depicting working relationships and interactions, such as social exchange and uncertainty reduction theories. The report also discusses how organizations can foster innovation and creativity, emphasizing the importance of learning cultures and effective teamwork. Finally, it analyzes the culture and structure of Tesco, exploring its decision-making processes and approaches to managing risk and uncertainty. The report concludes with an assessment of the effectiveness of organizational decisions within Tesco.