In this version of the mathematical theory, Warfield has used only algebraic and set theory explanations to describe ISM, without using any matrices. This was done in response to statements from some people who had said they didn't know matrices. The book Societal Systems: Planning, Policy and Complexity deals with the same topic and uses matrices.

A publisher's offprint is in the GMU Library Special Collections but it does not include four pages from Warfield's original manuscript which were not printed as part of Chapter 5 in Olsen's book, but instead were placed in an APPENDIX section on pages 408-411.  Warfield's office photocopy used for handouts recombines the two printed sections as originally written. 

The published book "Group planning and problem-solving methods in engineering management, Shirley A. Olsen 1939-1982"  is available at George Mason University Fenwick Stacks (HD30.29 .G76 1982 ) The publisher offprint without the 4 pages from the Appendix is in Box 5 Folder 25 in Fenwick Library's Warfield Collection C0016.

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