Critically evaluate effectiveness of leadership approaches and change management models11 CONCLUSION 11 REFERENCES 12 INTRODUCTION Every business organisation aims at implementing change in its business operations and activities in order to sustain in competitive business environment. Marks & Spencer is a British multinational retailer |that serves in 1463 locations in 57 countries around the world- wide. |Tesco|Marks & Spencer| |Tesco is a British multinational|Marks & Spencer is famous for | |general merchandise and grocery |