Cognitive skill can be modeled using production rules, if-then pairs

a. Production rules are condition-action pairs that describe the conditions when the rule applies and the action to be taken. The conditions are matched against the contents of working memory, which can include goals. Goals can also be set within the action component of the rule.

b. Each production rule is modular, with more complex cognitive processes resulting from the process of chaining production rules. (Anderson, 1993)