Organising is the process of defining activities, establishing relationships between them, and ensuring efforts are directed towards goals. It involves dividing work, grouping related tasks, assigning duties, and defining reporting relationships. Organisational structures like functional and divisional determine how work is grouped. Formal structures have set rules while informal ones focus on relationships. Delegation and decentralisation are important concepts, where delegation transfers authority from superiors to subordinates, and decentralisation distributes decision-making power throughout levels of management.