Organisational Behaviour is an emerging discipline. It attempts to shed light on human behaviour in organizations. The complexity in understanding human behaviour required an academic discipline to suggest solutions to behavioural problems. While behaviour is unique, its understanding requires multidimensional approach. Organisational culture, climate and external environment influence behaviour. And the behavioural consequences largely determine the effectiveness of organization as a whole. Behavioural conflicts are kindled by faulty organization structure, whereas, sound organization structure paves way to organizational effectiveness. In Public Enterprises the problem of misunderstanding behaviour arises out of inappropriate organizational design and ineffective leadership styles of managerial team. The problems of Public Enterprises are more brought to limelight due to globalisation, economic reforms and promotion of private sector enterprises. Thus the study combines both theoretical and practical approach to understand the complex human behaviour. The main themes discussed herein are: Organisational Behaviour- Concepts and Models; Leadership Styles and Contingency Behaviour; Organisational Process and Leadership Attitudes; Effectiveness of Organisational Process, etc. The book helps planners, policy makers, academicians and students to a greater extent to bridge the gap between theory and practice.