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The Internet is playing an important role not only in information retrieval, but also in industrial process manipulation. This paper describes an approach to writing requirements specifications for Internet-based control systems and to deriving architecture for this new type of control system according to the requirements specification. Specification is described in terms of a functional model and then extended into information architecture. In contrast to the functional model, the information architecture gives an indication to the architecture of the Internet-based control systems. An integrated-distributed architecture has been derived from the functional model and the information architecture as a case study.