14-08-2012, 05:06 PM
Process Modeling
208-dataflowdgm.ppt (Size: 1.25 MB / Downloads: 137)
A process model is a formal way of representing how a business operates
Data flow diagramming shows business processes and the data that flows between them
Logical process models describe processes without suggesting how they are conducted
Physical models include information about how the processes are implemented
Decomposition is the process of modeling the system and its components in increasing levels of detail.
Balancing involves insuring that information presented at one level of a DFD is accurately represented in the next level DFD.
Context Diagram
Shows the context into which the business process fits
Shows the overall business process as just one process
Shows all the outside entities that receive information from or contribute information to the system
Level 0 Diagram
Shows all the processes that comprise the overall system
Shows how information moves from and to each process
Adds data stores
Level 1 Diagrams
Shows all the processes that comprise a single process on the level 0 diagram
Shows how information moves from and to each of these processes
Shows in more detail the content of higher level process
Level 1 diagrams may not be needed for all level 0 processes
Level 2 Diagrams
Shows all processes that comprise a single process on the level 1 diagram
Shows how information moves from and to each of these processes
Level 2 diagrams may not be needed for all level 1 processes
Correctly numbering each process helps the user understand where the process fits into the overall system