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Structural Validation of Causal Loop Diagrams

In this paper, we present techniques for manually testing the validity of each link in a causal loop diagram (CLD). A link is defined as consisting of an origination quantity, a destination quantity and a connection edge between them. Each link is considered as a separate and distinct causal hypothesis whose validity should stand on its own merits. Following Goldratt, criteria for determining the validity of the CLD are adapted and demonstrated. Eight possible validation criteria are consi dered: clarity, quantity existence, connection edge existence, cause sufficiency, additional cause possibility, cause/effect reversal, predicted effect existence, and tautology.