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Problems in Causal Loop Diagrams Revisited
	Author(s): George P. Richardson	Subject: System Dynamics
	A discussion of the discrepancies which can result from the S (Same) and O (Opposite) notation commonly used to label links in word-and-arrow diagrams.
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Problems with Causal-Loop Diagrams (D-3312-1)
	Author(s): George P. Richardson	Subject: System Dynamics
	A discussion of the difficulties in the traditional definitions of positive and negative links in causal-loop diagrams. Possible improvements are suggested. From Road Maps 4.
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