When would you typically use circumstancing?

Circumstancing is typically used to manage variations in rules based on different contexts, and one common scenario for applying this technique is when specific business conditions change, such as a change in sales tax rates. This allows the system to adapt dynamically by applying different logic or calculations based on the current circumstances.

By using circumstancing in this instance, you can ensure that the application applies the correct sales tax rate specific to the jurisdiction or any other relevant factor that necessitates different handling of rules. This enhances the application's ability to react accurately to live business conditions without requiring significant rework or multiple versions of the same rule.

The other options, while relating to potential instances in application development or maintenance, do not directly align with the primary purpose of circumstancing. Enhancing user experience, reducing development time, or improving application security may involve different techniques such as user interface enhancements, efficient coding practices, or implementing security protocols, rather than specifically managing rule variations due to changing business conditions like tax rates.