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International audienceVolume flexibility enables firms to cope with demand fluctuations but being flexible incurs costs. Hence, firms are challenged to choose economically adequate volume flexibility instruments. To tackle this challenge we present a three-step approach comprising a preliminary analysis and a model of a production system that takes into account different volume flexibility instruments. The model is solved minimizing production costs. For a multidimensional sensitivity analysis we use design-of-experiments methods in the third step to assess the impact of the instruments and their interactions. In a case study we apply our approach to a real life NP-hard production planning problem of a car manufacturer that is solved by approximate dynamic programming. Using design-of-experiments methods we gain managerial insights into the value of different combinations of volume flexibility instruments