CC BY-NC-ND 4.0Block, LukasLukasBlock2024-07-012024-07-012024https://publica.fraunhofer.de/handle/publica/470598https://doi.org/10.24406/publica-332910.1017/pds.2024.5310.24406/publica-33292-s2.0-85194055438Anticipating all technical requirements that a product must meet throughout its lifespan has become difficult due to a rise in market, regulatory, and technological uncertainty. As a result, the attribute values of these requirements may be highly uncertain at the start of product development. We propose a mathematical model that captures and quantifies this uncertainty in a clear and comprehensive manner. We evaluate the approach by encoding uncertain requirements for an automotive project. Misconceptions regarding probabilities are alleviated and the requirements are unambiguously defined.enopen accessRequirements ManagementUncertaintyModellingjournal article