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A robustly engineered monitoring and measurement capability provides comprehensive and timely performance information that allows broadband network operators and service providers to observe and proactively respond to events that occur during deployment and operation of their respective networks. As network complexity increases, so do the requirements for monitoring and measurement to ensure the high-quality service to internal and external customers. A methodology for monitoring and measurement of complex broadband networks is presented. This methodology includes a framework and reference architecture, essential metrics categories to refine and focus the collection of information and extensions to support net-centric enterprise systems driven by service-oriented architecture (SOA). Examples of the application of the methodology to complex broadband networks are provided along with suggestions for further work.