PIGS—A system for programming with interactive graphical support
Man‐Chi Pong, N. Ng · Software Practice and Experience · 1983
Abstract This paper describes an implementation of a system for programming using structured charts with interactive graphical support. It provides a graphical editor for the user to interactively build and edit programs using Nassi‐Shneiderman diagrams (NSD)1 as the structured control constructs of logic flow. It can interpret a program in NSD chart form, and the execution sequence of the NSD is displayed at a graphical terminal. On‐line debugging and testing facilities are available which allow the user to examine and modify the program under execution. The system has been designed with the aim of supporting the development, debugging, testing, documentation and maintenance of programs in the same environment.