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A standardized data model as common language for disciplinary communication in aircraft design could have a significant impact on the efficiency of conceptual/preliminary design efforts and collaborative research in aircraft design. This paper discusses if such a standard could be established and under which circumstances this would make sense. The Common Parametric Aircraft Configuration Scheme (CPACS) is introduced as one potential step towards a unified data model. Experiences in coupling established Multidisciplinary Design Optimization (MDO) environments with CPACS are presented and requirements for setting a standard are discussed.