Grenzplankostenrechnung (GPK) is a German costing methodology, developed in the late 1940s and 1950s, designed to provide a consistent and accurate application of how managerial costs are calculated and assigned to a product or service. The term Grenzplankostenrechnung, often referred to as GPK, has been translated as either Marginal Planned Cost Accounting or Flexible Analytic Cost Planning and Accounting. Resource Consumption Accounting (RCA) is based, among others, on key principles of German managerial accounting that are found in GPK.