Attempted to show that individuals are sensitive to differences in the use of the operator or. Results show that on a variety of tasks, Ss were sensitive to differences between or sentences malformed because there was no topical relation between the disjuncts and well-formed or sentences which satisfied the constraint of common topic. In the case of well-formed or sentences, Ss were sensitive to differences between the ordered or asymmetric use of or, as in threats, and its unordered or symmetric use, and in the latter case between its use as an exclusive and exhaustive term, as an exclusive term, and as a (possibly) inclusive term. Results suggest that any attempt to discover the unique conceptual representation of an operator such as or is misguided, and that the generalizability of any findings obtained by study or some particular use of or should be questioned. (PsycINFO Database Record (c) 2006 APA, all rights reserved)