It takes the values defined here:

https://github.com/ministryofjustice/civil-claims-spec/blob/numeral-validations/features/01_Start_a_case/02_Case_details.feature#L108

And uses them to construct the methods.

> Could it be made clearer by delegating to a named method in the 'about_the_case' section?

Sure, just give me an example on how you'd like it...