Domain partitioning

To partition the domain means to organize the
different types of functions that the system must
support. These functions were defined in the use
cases model. The use cases should be organized
using the principles of cohesion and coupling so that
related use cases appear together. Each of the
resulting groups should provide all of the data
resources that users need to successfully complete a
reasonable unit of work. These resources are defined
in the problem domain class diagram and interaction
diagrams. Domain partitioning is somewhat
subjective and involves significant interaction with
the users. However, as you learn the process, you
will develop techniques to measure the quality of the
groupings more objectively.