Nerlove and Romney (1967), using assumptions about conjunctivity and markedness, identified a set of necessary conditions which any existent terminological arrangement of true siblings must fulfill. The present paper generalizes and extends their assumptions, explores the psychological bases of these assumptions, and investigates the degree to which these revised assumptions represent a set of conditions such that (given enough cases) any terminological arrangement that meets them should be expected to occur in some natural system.
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David B. Kronenfeld (1974) studied this question.
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