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One of the most important approaches to requirements engineering of the last ten years is the KAOS model. The authors introduce a profile that allows the KAOS model to be represented in the UML. The paper includes an informal presentation of the profile together with a full account of the new stereotypes and tags. They also outline an integration of requirements models with lower level design models in the UML, leading to a uniform and comprehensive specification document. A UML profile can increase the usefulness of KAOS. A method can be truly successful only if a large number of professionals are sufficiently convinced of its potential to use it in industrial cases. Use of the UML to support requirements engineering with KAOS may help achieve this end.