This report discusses the comparison of Tesco and Sainsbury and their impact of change in the organizational strategy, also the ways of internal and external drivers of change affect. It will identify the ways in which internal and external drivers of change affect the leadership, team and department and individual in organization. Apart from this it will evaluate measure which would be taken to minimize the impact of change on organization behaviour by using the appropriate theories of change management. It would analyse the barriers of change and determine how they leadership decision-making in Tesco and Sainsbury. At last, it would measure the different leadership approaches to deal with change in both the organizations.