Abstract: Building a composite web service as per the userís complex need requires using the multiple online web services available. Selecting the best web service for composition will become combinatorial problem leads to be the NP complete problem. To solve this problem we are proposing a framework for composite web service using ant colony optimization algorithm. For choosing the proper path selection in ACO, we are negotiating with individual web service to select it for the participation during composite web service. For negotiation we are using intelligent agents for analyzing web services for based on semantic, WSDL and QOS description. As per the profile of the users the negotiation agents are built for building composite web services.

Keywords: Mobile agent, web service composition, QOS, SOA, ACO, WSDL.