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<br />e <br /> <br />e <br /> <br />e <br /> <br />003" 4 8 <br /> <br />first, after which the results of the separate evaluations would be combined to <br />look for important interaction effects between the components (for an <br />inventory of the user needs. refer to the Needs Analysis), <br /> <br />Table 3 contains brief descriptions of five different ways of representing the <br />interactions between state information. process information (models) and. <br />analysis tools, In Table 4 these architecIures are evaluated with respect to the <br />following criteria: <br /> <br />"State Extensibility" refers to. the ease with which an architecture can <br />accommodate for extension of its database or can be applied to another case, <br />such as another watershed. so-earn, or river basin, <br /> <br />"Process Extensibility" refers to extensibility with respect to models. It Process Extensibility <br />concerns the efforts needed for extending an existing system with new versions <br />of already integrated models or the addition of new models, <br /> <br />Maintainability refers to the operation and maintenance of a particular Maintainability <br />architecture. Systems mainly based on third party software are easier to <br />maintain than custom developed software, <br /> <br />State Extensibility <br /> <br />Performance relates to the execution speed of a system, Performance <br /> <br />Modularity: the availability of intermediate products during system <br />development. Some architectures allow for parts of the system/functionality [0 <br />become available during development, whereas others only allow products [0 <br />be brought on line after complete development is finished. <br /> <br />Development costs: costs for implementing the architecture. <br /> <br />Modularity <br /> <br />Development Cost <br /> <br />Extension costs: costs for extending an existing system, <br /> <br />For scoring the various types of architectures on these criteria we used the <br />categories "poor". "moderate". and "good" for the first five criteria and "low", <br />"moderate", and "high" for the twO types of costs, <br /> <br />Extension Costs <br /> <br />DAMES& M OORE/CADSWES-28 <br />