Planning is an ongoing process that involves setting goals and strategies to achieve those goals. It occurs at multiple levels from corporate to functional. Strategic planning focuses on long-term goals over 5-10 years while operational planning provides short-term details on implementing strategies over 1-2 years. Effective planning requires involvement across the organization, clear communication of goals, and contingency plans for changing environments. Barriers like resistance to change can be overcome through participation, diversity of views, and strategic thinking.