In search of a simple visual vocabulary
Eric Freeman, David Hillel Gelernter, Suresh Jagannathan · 2002
Visual languages are more complex than we would like. We introduce a small but powerful visual vocabulary for a visual programming environment that is simple, yet expressive enough to represent the structure of programs and program executions. This vocabulary is not based on any existing textual language. It was designed for the purpose of visually representing and understanding programs and their executions.