  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.
