20
Figure 2. 11
Illegal and Legal Data Flow Diagram
(Source: Whitten, Jeffry L.,
Bentley, Lonnie D., and Dittman, Kevin C. 2000. System Analysis and Design
Methods)
2.1.4.3 Commonly Error in DFD
According to Whitten [4], there are 3 commons errors in DFD
1. Process
3.1.2
has
input
but
no
outputs.
We
call
this
a
black
hole
because
data
enters the process and then disappears. In most cases,
the
modeler simply
forgets
output.
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