The nature of Web systems is substantially different from more conventional software systems. They are developed in shorter timeframes, often act as the direct interface between multiple stakeholders, meet a more generic set of requirements, and generally serve a less specific user group. They are often developed very quickly from templated solutions, using coarse-grained authoring tools, and by the efforts of a multidisciplinary team. There is often considerable uncertainty on the part of the client as to their own requirements. The importance of defining the objectives of the system during the early stages of a project are generally acknowledged to be important, but access to the tools and templates can encourage developers to build too early. Often requirements are inadequately documented, or only emerge during development, or change as development proceeds. The immaturity of the industry and the lack of standardised processes in web development have been demonstrated by web-based solutions that in many cases fail to meet fundamental requirements. Specifications for Web systems are consequently very different from those for more conventional software systems. Apart from an increased emphasis on user interactions and the underpinning content, they also reflect a blurring of the boundaries between requirements, specifications and designs in the development process. In this paper we offer an iterative model for Web systems development that incorporates the user of partia
