Composite Web services are an organized structure that cumulate with all other web services and interact according to the users demand. The primary objective of this thesis is to suggest a dynamic selection for web service composition automatically, in which user requirement is used as selection criteria. Composite WS are divided into long and short term. While in long term composed WS all the components and relationship between those components are already defined. Since web services are provided by different service providers there is no guarantee for its functionality and its availability. Hence, change management is an important issue in LCS. In this paper I worked on top down changes that i.e., those changes which are initialized by the owner of a LCS. The owner of LCS will change some functionality of a composed web services in order to attract more customers. This change was taken as a challenging issue and according to the change requirement the LCS will composite itself automatically. In this thesis, web service composition for travel agency system based on functional characteristics is presented.
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