[en] On the availability of energy raw materials in the critical transition phase and on the necessity of system analytical availability investigations. An energy policy of consumer countreis with an eye to the future must adapt itself to the fact that the coming decades will be a critical transition phase regarding energy raw material supplies. Supplier and consumer countries will be confronted by a resource crisis in a wide and serious sense of the word during this critical transition phase. The energy policy of a country depending to a large and increasing extent on imports of energy raw materials, such as West Germany, is urgently in need of a realistic estimate of the resources problem. The complex and wide ranging problems of the critical transition phase require crossing of interdisciplinary boundaries and analysis of greater dimensions for their investigation. After available experience in system analysis in the energy field, there is no doubt that a solution of the resources problem is possible using system analytical availability investigations. (orig.)