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Item Report on the EEC Workshop on Graphics Certification Defining a Device Interface for Certification Miltenberg/Darmstadt, FRG25-28 April 1982(Blackwell Publishing Ltd and the Eurographics Association, 1982) Brodlie, K.W.; Pfaff, G.E.The outcome of the Miltenberg meeting shows that a practical method of certification by testing (falsification) can be developed, given a reasonable amount of time and effort. It is based on semiautomatic comparison at the "device" interface of a candidate implementation against a so-called reference implementation. A prerequisite for this method is the availability of a number of isolated simple basic facilities of the candidate implementation which have been verified by pictorial testing and by testing through operator actions.To permit semi-automatic comparison, a format for describing graphical output and input items and their associated properties must be defined. The workshop produced an outline design for such a format, which can be applied at any interface within GKS at which testing might be desirable.Item Report on Workshop on Validation of Graphics Software(Blackwell Publishing Ltd and the Eurographics Association, 1985) Brodlie, K.W.; Gobel, M.