The Process Modelling Stages

1. Context DFD
• Establishes initial project scope
• Simple, shows only sys's main interfaces w/ its environment
  
  
2. Functional Decomposition Diagram
• partition the system into logical subsystems and/or functions
  
  
3. Event Responses (Use Case List)
• ID's + confirms the biz events which the sys must respond to
• Describes required or possible responses to events
  
  
4. Add Event Handler to decomp dia.
• Further partitions the functions
  
  
5. Event Diagram (1 for each event)
• Simple DFD w/ event handler, inputs + outputs for events.
  
  
6. System Diagram
• Merge event diagrams into sys dia.
• Shows the 'big picture' of the system
  
  
7. Primitive Diagram
• Build for event processes that need additional processing deets.
  
• Logic of each process explained
• Data structure of each elementary data flow described.