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In the automotive and supplier industry, CAD data are generated and processed in different CAD sys tems and in formats and structures that are not always compatible. The data flow in the process chains (internal and external data exchange) can be impeded in some cases in spite of standardised interface formats (VDAFS, IGES, STEP). Differences in the way data are generated and structured at different companies, in the range of elements, and in the internal display in CAD systems, and the fact that authors and recipients of data have different tasks, mean that a lot of cost and effort are required to process CAD data at downstream departments before they can be used; in extreme cases, such data cannot be used at all... This also applies to CAD data in the process chain that are transferred within a single CAD system in the company's format. This is because different processing steps in the process chain can apply different quality requirements for these data... VALIDAT is an..