A Product Line Architecture for Evolving Intelligent Component Services in Tourism Information Systems Daramola J.O a , Adigun M.O b , Olugbara O.O. b a Department of Computer and Information Sciences Covenant University, Nigeria dwande@gmail.com b Centre for Mobile e-Services for Development University of Zululand, South Africa madigun@pan.uzulu.ac.za, oluolugbara@gmail.com Abstract The challenge facing developers of Tourism Information Systems (TIS) is the need to evolve more intelligent and dependable tourism support services. However, this kind of information systems has largely identical functionalities and delivers almost similar services. The systems differ mostly in the customized information contents they deliver and the scope of the tourism interest that is being promoted. The peculiarity of the e-Tourism domain makes it ideal for product line development. In this paper, a reference Tourism Product Line Architecture (TPLA) as a platform for evolving intelligent component services is proposed. The TPLA is a layered architecture of core reusable components that can be leveraged for the development of TIS product family. The architecture is extensible and its components are formally specified as possessing intrinsic intelligent attributes and the semantic awareness that are desirable for the next generation of Tourism Information Systems. Keywords: Product line, e-Tourism, Formal Specification, Intelligent Component 1 Introduction Tourism Information Systems (TIS) are software applications that are deployable on the web and on small hand-held devices and dedicated to the provision of tourism business support services. TIS share many attributes in common and generally perform similar functions such as providing useful information to prospective tourists and helping in travel planning and management. They mainly differ in the nature of local information content they deliver and the scope of tourism interest that is being promoted. They can be variously engaged in the promotion of tourism at the national, continental, regional, state, local and enterprise levels. This degree of observable similarity in TIS makes them good candidates for a product line development