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# rules

The list of rules to be executed when evaluating the system.

```
var rules: [GKRule] { get }
```

## Discussion

This array holds all rules under consideration by the system—that is, the union of the [`agenda`](/documentation/GameplayKit/GKRuleSystem/agenda) and [`executed`](/documentation/GameplayKit/GKRuleSystem/executed) lists. The agenda holds the rules to be considered when evaluating the system, listed in order of their [`salience`](/documentation/GameplayKit/GKRule/salience) values (or, for rules with the same salience, the order in which they were added to the system). During evaluation of the rule system, if a rule on the [`agenda`](/documentation/GameplayKit/GKRuleSystem/agenda) list is satisfied (that is, its predicate returns <doc://com.apple.documentation/documentation/Swift/true> and it executes its action) the system moves that rule to the [`executed`](/documentation/GameplayKit/GKRuleSystem/executed) list.

Changing the salience of a rule already in the rule system does not adjust its position in the agenda, but does determine the order of the new agenda when resetting the system.

## See Also

[`-  reset`](/documentation/GameplayKit/GKRuleSystem/reset())

Returns the rule system to its original agenda and clears all facts.

[`agenda`](/documentation/GameplayKit/GKRuleSystem/agenda)

The list of rules to be considered when evaluating the system.

[`-  evaluate`](/documentation/GameplayKit/GKRuleSystem/evaluate())

Evaluates the rule system, executing the list of rules in its agenda.

[`executed`](/documentation/GameplayKit/GKRuleSystem/executed)

The list of rules whose actions have been performed during evaluation of the system.


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