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This makes a customer a so-called
domain block . Other candidates for domain blocks include, e.g., a phone call, the
usage right, and usage data.
A domain block represents an object, a concept, a location, or an individual
from the real-world domain. A domain block is directly known to the system.
To better understand what we mean by the term ??? domain block, ??? let ??™ s take
a brief look at a counter example. The term ??? customer billing ??? is a domain term
from the glossary. But the on-board computer does not directly deal with customer
billing. In fact, it doesn ??™ t know the term. So it is not a domain block. Other
examples for non-domain blocks are normally the actors and objects our system is
composed of, such as the card reader.
Table 2.15 Summary: Modeling the domain knowledge.
Reference card: Model domain knowledge.
Incoming and outgoing data
Requirements:
General requirements to the system.
Use cases [object fl ow]:
Use cases with object fl ow in fl ow
descriptions.
Domain knowledge:
Structures of the system ??™ s domain
terms.


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