An enterprise planning system covers the methods of planning for the internal and external factors that affect an enterprise.
These factors generally fall under PESTLE. PESTLE refers to political, economic, social, technological, legal and environmental factors. Regularly addressing PESTLE factors falls under operations management. Meanwhile, addressing any event, opportunity or challenge in any one or many factors for the first time will involve project management.
As opposed to enterprise resource planning (ERP), enterprise planning systems have broader coverage. Enterprise planning systems address the resources that are available or not available to an enterprise and its ability to produce products or resources and/or provide services. It also considers those factors that will positively or negatively affect the firm's ability to run these actions.
Enterprise planning systems will tend to vary and are flexible. These are due to the periodic and adaptive nature of strategy formation. These will also have tactical aspects. Typically, enterprise planning systems are part of a firm's knowledge base or corporate structure whether it formally identified and structured or simply executed these when the need appeared.