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In the highly competitive telecommunications environment of today a service provider must continually evolve its network and enable new revenue-generating services faster and more cost effectively than the competition. These services should create value for the end users by satisfying all their functional requirements in an efficient manner, and they should be delivered with simplicity and ease of provisioning. This paper focuses on the transition from a requirements capture and analysis phase to a service analysis phase in the framework of an object- oriented service creation methodology, by considering the internal structure and the functionality of a telematic service. After the examination of the main activities that take place in the service analysis phase and the identification of the main artifacts that are produced during them, the overall service development process is highlighted, and the paper attempts to validate, through several service creation experiments, not only the service analysis phase, but also the overall service creation methodology. Finally, the validation results are discussed and further evaluation actions are briefly outlined.