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In this paper, a method for planning and analyzing a dynamic optical transport network is described. The method is "event based" and a relative time scale is adopted. Events include setting up/tearing down optical channels and failure/restoration of network elements. Each connection demand is characterized by its own type of protection, routing strategy and priority, independently of the correspondent attributes of the other demands. The method works in two main modes: Design and Analysis. In Design mode the network is sized according to the offered demand while in the Analysis mode the network resources are assigned beforehand and the behavior of the network (traffic lost in case of lack of resources or failures) can be evaluated. The method is implemented by a computer program based on a new particular representation of the network, specifically conceived to effectively model optical transport networks. The paper will also include an example of design and analysis of a realistic Italian Optical network.