Myriad™ groups under a single convenient interface a set of essential performance models, and is an excellent tool for anyone involved in Performance Analysis and Capacity Planning. Myriad includes many classical queueing models such as simple finite and infinite queues, central server model of multiprogramming, a model of a multiprogrammed interactive system, as well as a number of important special models such as multi-class loss model, an original model of bandwidth sharing, a model of a tandem system with blocking, a model of a Token Ring LAN, or Internet specific client-server models, in particular, related to World Wide Web performance viewed both from the client side and the server side.