Issue No. 04 - Dec. (1975 vol. 1)
Jan Witt , Siemens AG, Munich, West Germany
This paper describes an interactive system-COLUM-BUS-forthe development of well-structured programs in Assembly language, Cobol, and PL/I. One of the basic concepts employed is the use of Nassi/Shneider-man charts  as the unique reference document. For specifying the control structure of a program, the programmer uses a set of control primitives which are common for all languages used. Data declarations and executable statements are taken from the individual language. This mixture is called the COLUMBUS source form. From this source form, Nassil Shneiderman diagrams and cross-reference matrices can be produced in a language-independent fashion; pure source for the individual languages is produced by a set of preprocessors in a language-dependent fashion. This paper illustrates the mechanisms involved by giving some small examples for the individual languages, and it also gives a brief history of the project and reports on quantitative and qualitative results obtained so far. The plans for future extensions are also explained.
Assembly, Computer aided software engineering, Indexes, Operating systems, Data mining, Software tools, structured programming, Assembler, Cobol, control structure, Nassi-Shneid-erman charts, PL//, preprocessors, software tools
Jan Witt, "The COLUMBUS approach", IEEE Transactions on Software Engineering, vol. 1, no. , pp. 358-363, Dec. 1975, doi:10.1109/TSE.1975.6312865