This document provides an overview of the roles and functions of managers and leaders in organizations, with a focus on the case study of Marks and Spencer. It discusses the definition and characteristics of leaders and managers, and explores different leadership theories and management functions. It also examines the application of these theories and models in different situations, such as stable situations, conflict situations, and fast-changing situations. The document highlights the impact of organizational situations on management functions and discusses the adoption of theories and models for effective management and operations.