Dual-process models of information processing contend that humans use two different processing styles. One is a quick and automatic style that relies on well-learned information and heuristic cues. The other is a qualitatively different style that is slower, more deliberative, and relies on rules and symbolic logic. Dual-process models have been developed to explain specific psychological phenomena, such as persuasion, person perception, attribution, and stereotyping. Other more generalized models have been proposed to simultaneously explain processing across a variety of domains.