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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.  The actors below are represented as having a hierarchical relationship for ease of understanding; however, these relationships can easily be removed.

  • Cancer Researcher: plans and performs activities related to discovery of new knowledge, drugs, and treatments in the field of oncology
    • Clinical Researcher: works directly with patients and/or patient data while performing cancer research
    • Basic Science Researcher: works with scientifically generated data while performing cancer research
    • Protocol Designer: defines the methods used to perform cancer research
  • Information Technologist
    • Information Modeler
    • Software Engineer
    • Systems Architect
    • System Administrator
  • Metadata Specialist
    • Metadata Curator
    • Metadata Systems Manager
  • : designs, develops, and manages the software and hardware necessary to perform cancer research
    • 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
  • Metadata Specialist: having a deep understanding of semantics and syntactic, assists Cancer Researchers and Information Technologists on modeling and managing metadata 
    • 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
  • Patient: any person who receives medical attention, care, or treatment
    • Subject: a Patient that is participating in Cancer Research
    Patient
    • Subject (study participant)