Abstract: Graphics such as isometric engineering drawings needed for piping fabrication and installation in the construction of an industrial plant are generated by building a physical miniaturized design model of the plant, applying visually exposed indicia to separate segments on the model with this indicia for each segment being identifiably descriptive of the distinguishing characteristics of such segment as it is to exist in the final industrial plant after its construction, and optically scanning the exposed indicia on the design model to thereby collectively record the scanned information on an electronic storage memory. The recorded information is then integrated by utilizing a general purpose computer with a compatible computer program and the combined result is supplied as electronic plotting signals to a graphics plotter to produce the graphics for use thereafter in construction of the full size industrial plant.