Abstract
Web Service is an interface which implements business logic. Performance is an important quality aspect
of Web services because of their distributed nature. Predicting the performance of web services during
early stages of software development is significant. In this paper we model web service using Unified
Modeling Language, Use Case Diagram, Sequence Diagram, Deployment Diagram. We obtain the
Performance metrics by simulating the web services model using a simulation tool Simulation of Multi-Tier
Queuing Architecture. We have identified the bottle neck resources.
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