Modelling Human Factors using the Systems Modelling Language

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HFIDTC/2/WP2.8.9/1Version 2/ 24th September 2008Figure 7-11 - Block Definition Diagram - Role to Task Mapping for the GroundCommander PostThe allocation of Swimlanes on Activity Diagrams is another way of mapping Roles toTasks/Activities. In Figure 7-5 we have a Swimlane indicating that the Activities on thediagram are performed by the Post of Ground Commander. We could update this tochange ‘ Ground Commander’ to ‘ Allocate resources’. This wouldprovide some flexibility as it is possible that this particular Role may be performed bymore than one Post.7.2.3.1 Value addedThe production of the diagrams above has added further to our understanding of thePersonnel requirements and has started to document the views of the H-Fly systemrequired by HV-F and HV-D. They have captured our initial thoughts on the Posts withinthe Organisational Units and started to define them in terms of the Roles they willperform, as required by HV-D. We have started to define competencies required for theRoles and mapped Roles onto tasks as required by HV-F.Through the creation of these diagrams we have also realised deficiencies in some of theexisting diagrams and updated them to maintain the integrity of the model.7.2.4 Modelling OrganisationsHV-D requires that we model Processes and Procedures because they affect theOrganisational Structures, relationships and lines of communication between Posts.Activity Diagrams are useful for this purpose. Figure 7-12 documents an example processfor compiling the Tactical Picture. Note that we are introducing a new term here thatneeds to be defined. There is a risk of confusion between ‘Tactical Picture’ and ‘Situation30
HFIDTC/2/WP2.8.9/1Version 2/ 24th September 2008Awareness Information’ that is used in the Use Case in Figure 7-3; these terms have beendefined in the Glossary in section 11.1.The input at the top of this diagram, ‘Job Assignment’, is the output from the ‘Assessrequest’ Activity Diagram in Figure 7-5. The Swimlanes on the diagram allocateactivities to the Posts of Ground Commander and Tactical Picture Compiler. Note theinclusion on the diagram of Blocks that have relationships with the ‘Gather relevantinformation’ and ‘send ‘Tactical Picture’ Activities. These indicate the inputs/outputsrequired and they represent UI objects. The use of SysML for UI design is discussed inmore detail in Section 7.2.6.Figure 7-12 - Activity Diagram - Compile Tactical Picture ProcessFigure 7-12 shows relationships between Posts at a low level. A top-level view of theorganisation as a whole is also required to give this context. HV-D distinguishes staticorganisational structures, defined by formal organisational structures and dependencies,e.g. rank structures and authority structures, and task-based organisational structures,where organisational groupings and relationships may change dependant upon31
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