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An Actor models a type of role played by an entity that interacts with the subject (e.g., by exchanging signals and data), but which is external to the subject. |
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Actors may represent roles played by human users, external hardware, or other subjects. Note that an actor does not necessarily represent a specific physical entity but merely a particular facet (i.e., "role") of some entity that is relevant to the specification of its associated use cases. Thus, a single physical instance may play the role of several different actors and, conversely, a given actor may be played by multiple different instances. |
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While UML 2 does not permit associations between Actors, this constraint is often violated in practice since the generalization/specialization relationship between actors is useful in modeling overlapping behaviours between actors. |
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The actors below are represented as having a hierarchical relationship for ease of understanding; however, these relationships can easily be removed. |
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* *Cancer Researcher*: plans and performs activities related to discovery of new knowledge, drugs, and treatments in the field of oncology |
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** *Clinical Researcher*: works directly with patients and/or patient data while performing cancer research |
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** *Basic Science Researcher*: works with scientifically generated data while performing cancer research |
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** *Protocol Designer*: defines the methods used to perform cancer research |
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* *Information Technologist*: designs, develops, and manages the software and hardware necessary to perform cancer |
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- Information Modeler: designs, defines, and describes the data that will be captured during cancer research activities
- Software Engineer: implements the software systems that are used to manage and perform cancer research
- Systems Architect: designs the software and hardware systems that are used to manage and perform cancer research
- System Administrator: manages the software and hardware systems that are used to perform cancer research
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- Metadata Curator: works hands-on with Cancer Researchers and Information Technologists to model and manage their metadata
- Metadata Systems Specialist: manages centralized metadata systems and assists with the design of metadata systems
- Terminologist: a metadata expert that manages and maintains the semantic concepts that underlie information models
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