To view the full copyrighted abstract written in Warfield's own words please use the DOI link given above.
A description of a new kind of flow-chart, designed to incorporate not only events and activities but also decision and logic functions. DELTA charts can display a number of different options, as well as `loops' in project plans, at the research and development stage. Slightly modified version of this paper later published in Battelle Monograph No. 1 “A Unified Systems Engineering Concept.”