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There has been a longstanding need for an international standard in computer graphics. The decision by ISO to define an international graphics standard was supported throughout the world and over the last six years there has been a thorough technical evaluation by the graphics experts of many countries. The result was that in December 1982 the Graphical Kernel System was accepted as a Draft International Standard and is expected to become the International Standard towards the end of 1985. The aim of this report is to introduce the reader to the concepts of GKS. All examples in this report are expressed using the 'c' language because of the GKS implementation available. The author assumes no prior knowledge of computer graphics.