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Accurate measurement and modeling of IP networks is essential for network design, planning, and management. Efforts are being made to detect the state of the network from end-to-end measurements using different techniques and paradigms. In this paper, the authors propose a novel concept to use in the modeling of real network scenarios under measurement and analysis. They called this new concept Service Condition. They explain their proposal's motivations and they use some simple examples to show how to apply the Service Condition concept to the study of real heterogeneous network scenarios.