IEEE/ICACT20220353 Slide.08        [Big Slide]       [YouTube] Oral Presentation
This is an excellent example of why do we have to abstract the target system. For instance, in the State of California, you want to head from LA to San Francisco. Without the abstraction, you cant identify the clear direction to the pathway. Therefore, to get a direction on the map, you have to abstract the route. The DFD is the same process. You need a clear abstraction viewpoint of the target system, in order to initiate the threat assessment. 

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