P4 Resource Functions

Description

The P4 Resource Functions view addresses resource (human and non-human) functions – i.e. the activities performed by Resources.

The primary purposes of the P4 view are to:

• Develop a clear description of the necessary data flows that are input (consumed) by and output (produced) by each resource.
• Ensure that the functional connectivity is complete (i.e. that a resource’s required inputs are all satisfied).
• Ensure that the functional decomposition reaches an appropriate level of detail.
• Provide implementation-specific realizations of the operational activities specified in the L4 - Logical Activities view.

The Functionality Description provides detailed information regarding the:

• Allocation of functions to resources.
• Flow of data between functions.

The P4 view is the systems view counterpart to the Activity Model (L4) of the operational view.

The P4 view may be used for:

• Description of task workflow.
• Identification of functional system requirements.
• Functional decomposition of systems.
• Relate human and system functions.

Implementation

The P4 view can be represented using:

• A P4 Resource Functions Taxonomy diagram for Function hierarchies. This diagram is based on the UML Class diagram.

P4 Resource Functions Taxonomy diagram

• A P4 Resource Functions diagram for Function flows. This diagram is based on the UML Activity diagram.

P4 Resource Functions diagram

• A L4-P4 Systems Function to Operational Activity Traceability Matrix.
  P4 Systems Function to Operational Activity Traceability Matrix
   
• A UML Class diagram.
• A UML Activity diagram.
  
• A SysML Block diagram.
  
• A SysML Activity diagram.