The document discusses organisation as a system from several perspectives. It begins by outlining how organisations have evolved over different industrial revolutions from feudal systems to modern digital organisations. It then describes key aspects of viewing an organisation as a system, including its components (inputs, processes, outputs, feedback), environment, and goals. Examples are provided of how the hospital system works. The systems approach provides a framework for understanding the interdependencies between organisational parts and adapting to internal and external forces. Questions are posed about applying this perspective to improve security or anticipate future organisational changes.