Peter Drucker is regarded as one of the most influential thinkers in modern management and administrative thought. He introduced a new perspective on management by treating it as a social function concerned with people, performance and organisational objectives. His major contribution was to shift attention from mechanical administration to effective management of human and organisational resources. Drucker emphasised Management by Objectives (MBO), under which organisational goals are clearly defined and managers and employees participate in setting objectives. Performance is evaluated according to the achievement of agreed objectives. This approach improves clarity, coordination, motivation and accountability. He also stressed that objectives should be specific, measurable and related to organisational priorities. Another important contribution of Drucker was his concept of the manager as an executive responsible for effectiveness. He distinguished efficiency from effectiveness. Efficiency means doing things correctly, whereas effectiveness means doing the right things. According to him, managers must focus on results, priorities and organisational performance rather than merely following procedures. Drucker also gave importance to decentralisation. He believed that decision-making should be delegated to appropriate levels of the organisation so that managers can respond quickly to changing circumstances. Decentralisation promotes responsibility, innovation and employee development. His concept of the knowledge worker was another significant contribution. Drucker observed that modern organisations increasingly depend upon people whose major resource is knowledge rather than physical labour. Such employees require autonomy, continuous learning, recognition and opportunities to apply