Modelling Human Factors using the Systems Modelling Language

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HFIDTC/2/WP2.8.9/1Version 2/ 24th September 2008At this stage we haven’t yet considered the Roles and responsibilities of the people withinthe GD and GCS and we haven’t allocated functions to people or systems. However wedo now know that within those Organisational Units functions will be performedincluding providing details, assessing requests and accepting requests. When we start tomodel operator Roles and responsibilities these operations must be included, if they areallocated to humans.One of the strengths of the SysML is that it promotes consistency between diagrams, sothat the messages on our Sequence Diagram will later become Operations on a BlockDefinition Diagram, which can be used to model user Roles and responsibilities and/orsystem functions within the H-Fly system.To continue with our modelling, the ‘Assess Request’ message/activity in the SequenceDiagram is decomposed in Figure 7-5 as an Activity Diagram. The diagram is annotatedto show what the various components are.The input to the activity is the receipt of the details for the request; the output is either anactivity to deny the request, or one to accept the request, which creates a signal to ‘AssignJob’. The diagram indicates the activities that must all be performed to make theassessment of the request (‘Determine requestors location’ etc.). It also shows that theseactivities will be performed by a Post of ‘Ground Commander’. This is indicated by theSwimlane and the text ‘ Ground Commander’. The HVs Meta Model in Figure9-1 shows that a Post is a type of Organisational Unit.22
HFIDTC/2/WP2.8.9/1Version 2/ 24th September 2008Figure 7-5 - Activity Diagram - Assess RequestBy putting the Swimlane on the diagram and allocating a Post of Ground Commander toit, we have made our first acknowledgment so far that these particular activities will beperformed by a person (or persons) in the Post of Ground Commander, i.e. we haveassigned responsibility for these tasks to the Ground Commander.Of course at this stage the assumptions detailed above could be challenged later on. Forexample, it is possible that some or all the activities shown in Figure 7-5 could be doneautomatically without any direct human intervention. One use of the model is todocument decisions made, so if this original assumption proves to be incorrect there willbe a record of when and how it was changed.23
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Modelling Human Factors using the Systems Modelling Language

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