should be thought of as a aquot;pipelineaquot; through which a single type of composite data may flow. ... Level 0 represents the partitioning of the context diagram into the major processes and dataflows of the system. The top data flow diagram in figure B.2 is an example. ... partitioning may still be necessary, e.g., Process 2.3 on the Level 1 data flow diagram might be partitioned on a Level 2 data flow diagram.
|Title||:||Designing Information Systems Security|