In this paper,we show the difference between management and leadership through a case study,by presenting a management situation in a company and by studying the facts in this situation,the events in this situation,the analysis of these facts and events,and the learned lessons from this case study.We analyze in this case study the managerial situation especially for a manager X in our case study,who had some flaws in his style of management leaking of leadership.We learn some general and specific lessons in relation to our studied managerial situation.Our analysis proposes multiple improvements of this managerial situation especially for the manager X by combining his management skills with his leadership skills.We show through this case study the main differences between the management and the leadership.Also,we illustrate in this paper the interest to combine leadership skills with management skills for the manager X in our studied managerial situation and to adapt the management styles for the manager X according to the managerial situation.