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Ubiquity in Information Systems (ISs) is a new requirement widely expressed by customers and users due to emerging and evolving communication and mobile technologies. The design of IS dealing with high technological risks requires a precise and appropriate development process which is lacking today. This paper tries to contribute to solving this problem by proposing a process for identifying and modeling ubiquitous requirements that is integrated into an existent IS engineering process. The process is model driven based on a set of model transformations intended to help model refinement and specific platform models generation. This approach is original by the use of an event driven logic as dynamicity and reactivity constitute major required properties from ubiquitous applications. The method is used to create a passenger assistant application in the intelligent transport domain.