- To find implicit concepts
- be aware of hints in the design
- search them out
- listen to language used and learn
- Scrutinise awkwardness of design
- Scrutinise code that does awkward things and is hard to explain
- Domain experts may be inconsistent - this may indicate an implicit concept
- Make constraints explicit
- Look at analysis models/patterns
- Ideally do not want to make procedures a part of the domain model - unless they are spoken about
Chapter 10
- State post conditions of operations and invariants of classes and aggregates - ** maybe as unit test? **
- Models are awkward because they are missing pieces - successive refactorings lead to conceptual contours which clarify the model
- Decompose design elements consistently with the domain
- A requirement that forces extensive change is a sign that the model does not fit
- ** Closure of operations **
- Carve off sub-domains
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