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An annoyance factor (or nuisance or irritation factor), in advertising and brand management, is a variable used to measure consumers' perception level of annoyance in an ad, then analyzed to help evaluate the ad's effectiveness. The variable can be observed or inferred and is a type that might be used in factor analyses. An annoyance effect (or nuisance or irritation effect) is a reference to the impact or result of an annoying stimulus, which can be a strategic aspect of an advertisement intended to help a message stick in the minds of consumers. References to annoyance effects have been referred to as annoyance dynamics. While the words "factor" and "effect," as used in the behavioral sciences, have different meanings, in casual vernacular, they have been used interchangeably as synonymo