Generalized Descriptive Geometry (GDG) denotes all techniques of imaging abstract objects and their relations, which are constructive in the same sense as the methods of classical descriptive geometry, i.e., there have to be algorithms concerning the abstract objects (may be decision processes) so that there are translations into algorithms working with the pictures instead of the abstract objects. Hence GDG is more than mere visualization though the borderlines sometimes are fuzzy. The paper presents an outline of standard methods. Some of them are very old and were originally developed outside mathematics.