Worker: Use-Case Specifier
The use-case specifier details the specification of a part of the system's
functionality by describing the Requirements aspect of one or several use cases. The
use-case specifier can also be responsible for a use-case package, and maintaining the
integrity of that package. It is recommended that the use-case specifier responsible for a
use-case package is also responsible for its contained use cases and actors.

Staffing 
A person acting as use-case specifier should be a good communication skills, both
person-to-person communication and writing. Knowledge of the business and technology
domain is good to have, but not necessary for everyone acting in this role. A use-case
specifier needs to be familiar with all tools used to capture the results of the
requirements workflow.
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