This presentation is part of the Declarative Expressions Self-Study Course.

Transcript

To decide whether to use declarative or procedural rules to do your calculations, follow these guidelines.

Use declarative rules when rules need to be executed:

• All the time
• Not well defined (i.e., no one can say that the rule will only need to be executed at specific times)
• Only when the input data changes
• Only when the stored result of the rule is used

Use procedural rules when rules need to be executed:

• At well defined intervals
• You need control of when a rule is fired