Kiesewetter, HelmutC. E. Vandoni2015-09-292015-09-2919801017-4656https://doi.org/10.2312/eg.19801021The programming language ALGRA is based on algebraicgraphic structures. The basic elements of ALGRA are binary formulas of these structures. As compared to DIGRA 73 abstract structural informations may be handled by ALGRA as well as graphical ones. Thus the applicability of ALGRA for abstract modelling is eatablished. Other ingredients of DIGRA 73, like embedding in a host language and prescription of the output process, will be retained. A summary of the main features of ALGRA will be given with special accentuation on modelling processes.10.2312/eg.19801021