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Summary form only given. Interval type-2 fuzzy logic systems (IT2 FLSs) fall into the category of "function approximation," and are widely used in fuzzy logic control, rule-based classification, signal processing, etc. On the other hand, a Perceptual Computer (Per-C) is an implementation of Zadeh's Computing With Words paradigm, and is used to aid people in making subjective judgments. This talk will, for the first time, explain the similarities (which are few) and the differences (which are many) between these two systems. It will do this by focusing on the inputs, outputs and components of an IT2 FLS and Per-C, contrasting them side-by side. Such comparisons are needed so that the Per-C is not confused with an IT2 FLS.