An insurer requires specific fields for a new Adjuster contact, which is a specific type...

Guidewire ' s Data Model Architecture utilizes Subtyping to handle scenarios where a general entity (like User or Contact) needs specialized variations. When the business requirement calls for an " Adjuster " that has unique fields not shared by other users (such as an " Adjuster License Number " or " Authority Level " ), the best practice is to extend the existing hierarchy.

First, the developer must Create an Adjuster subtype entity (Option C). By making Adjuster a subtype of User, the new entity inherits all the standard fields, arrays, and foreign keys of the parent User entity. This preserves the " is-a " relationship, allowing an Adjuster to be used anywhere the system expects a User object (such as in assignment logic or UI participants lists).

Second, the developer should Add the new fields directly to the Adjuster subtype entity (Option A). Because these fields are defined only on the subtype, they do not " clutter " the base User table or impact the memory footprint of other user types (like underwriters or agents). This is far more efficient than adding fields to the base entity and leaving them null for everyone else (Option B).

Using a separate entity with a Foreign Key (Option D) is generally discouraged for " type-specific " data because it requires extra database joins and more complex Gosu logic to retrieve related data. Subtyping leverages Guidewire ' s built-in polymorphic capabilities, ensuring that the application remains performant and the data model remains clean and logically organized.