Which of the following would NOT be a reasonable way of identifying the classes for your domain model class diagram?

Question

BlackTom AI · Accepted Answer

When evaluating how to identify classes for a domain model class diagram, the core challenge is choosing methods that accurately reveal the domain concepts without overreliance on a single technique.
The provided option is: 'Asking the user at a story mapping workshop for a list of all the classes required for the UML domain model class diagram.'
Reason this approach is not ideal: story mapping is a collaborative technique primarily aimed at understanding user journeys, what features are needed, and how work flows from a user's perspective. It is not designed to yield a complete, stable, and technically correct list of domain model classes. Relying on a workshop to produce a comprehensive inventory of all domain classes risks overlooking technical constraints, invariants, and relationships that emerge from the domain model itself. In short, this method is too coarse-grained and user-story–centric to reliably identify every class and their responsibilities for a UML class diagram.
Additionally, without cross-checking against domain concepts, rules, and existing models, such a list may include classes that are too coarse or too fine-grained, or miss essential boundary conditions and collaborations between objects. A more robust approach would combine domain-driven analysis (e.g., identifying aggregates, entities, value objects, and services), interview stakeholders, review existing domain artifacts, and iteratively refine the model with incremental modeling sessions.
As for the lack of other options in the provided set: since the answer options are not present, there is no basis to compare this choice against alternatives that might be more reasonable (e.g., starting with ubiquitous language, analyzing domain events, or deriving classes from real use cases and business rules). Without those competing options, we can still assess the stated option on its own merits as a potentially ineffective method for comprehensive domain modeling.
To summarize the core issue: using a story mapping workshop to list all domain model classes tends to produce an incomplete or unbalanced class diagram, making it an unreasonable sole strategy for identifying the full set of domain classes.

Which of the following would NOT be a reasonable way of identifying the classes for your domain model class diagram?

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