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The classic knowledge based applications are mainly focussed on getting the most out of existing knowledge and individual software programs. It is closest to the fundaments of Quaestorin of Quaestor in which the Knowledge Engineer fills the knowledge base with a lot of "nuts & bolts" (ofcourse with smart constraints etc.) and the user builds a model on the basis of these "nuts & bolts" by using the modeler of Quaestor. Through input, choices and sometimes rejection of relations, together with the reasoning mechanism of Quaestor, the user comes to a solution which contains both end results and the model with intermediate results it is based on.

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Very powerful applications can be made on the basis of the classic approach. Examples are the propeller design suite KOAS of [Van Voorden Gieterij] in which some of the external hydrodynamic programs are used iteratively to find a balanced propeller design, or MVR of MARIN that uses the existing resistance and propulsion analysis tools together with MS Excel and Word to streamline the analysis and reporting process.

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