Watkins, H.K.P.J.W. ten Hagen2015-09-292015-09-2919831017-4656https://doi.org/10.2312/eg.19831002A Graphical Package is described with particular reference to the petroleum industry. One of its design aims is that it should act as a user interface to GKS and be as user friendly as possible. As a further design aim, it has to be capable of implementation as a stand-alone graphics package in situations where GKS is not. available. The implications of these design aims are outlined.10.2312/eg.19831002