This article will propose a planning approach for chemical multipurpose plants that is based on an evolutionary improvement of the current situation in the future. The basic idea is to keep the functions of the planning roles alive (requirements planning, strategic planning, operative planning, supply chain management/supply chain coordination), but to give all roles access to the information and to allow each planning role the simulation of planning situations in an integrated system. This way, the typical hierarchical planning approach can be altered to respond to the more flexible nature of the planning situation. The article will also present data visualization and data processing techniques as well as procedures for requirements and production planning that support such a planning approach.