Planning involves thinking ahead about what needs to be done, how it will be done, and who will do it. It is a process of selection among alternatives for future actions. Planning occurs at three levels - strategic, tactical, and operational. Strategic planning sets long-term goals, tactical planning focuses on middle management goals to support strategic plans, and operational planning develops short-term action plans at the lower levels. Effective planning involves setting objectives and choosing alternatives to meet goals in a changing environment.