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If the Bill Harris quote (SD2366) See "Converting Signed Digraphs to Forrester Schematics and Converting Forrester Schematics to Differential Equations" by J. R. Burns, IEEE Trans. Sys., Man, Cyber. Vol. SMC-7, No. 10, Oct. 1977, pp. 695-707. (I was going through some old files, and, no, I...

Who, first, introduced causal-loop diagrams into
SD modeling process?
Thanks in advance,

Nicola Bianchi <bianchi@ge.cnr.it>
CNR-CST
National Research Council of Italy
Centre for the History of Technology
Via Balbi, 6
16126 Genoa, Italy
fax: +39 010 209 9826
http://www.ge.cnr.it/CST/M&S/