CHAPTER 2
THEORETICAL FOUNDATION
A source or destination symbol on the DFD represents an organization or
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individual that sends or receives data that the system uses or produces.
DData Flows.
Formatted: Bullets and Numbering
A
data flow represents the flow of data between processes, data stores, and data
sources and destinations.
DTransformation Processes.
This represents the transformation of data.
Formatted: Bullets and Numbering
DData Stores.
Formatted: Bullets and Numbering
A
data store is a temporary or permanent repository of data.
3 TYPICAL DFD ELEMENTS FIGURE ROMNEY P.64
Further
explanation on the
elements of
DFD
will
be
described
in Appendix
2.
This
supplementary
description
will
clearly
identify
the
different
symbols
of
DFD used in this thesis.
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2.6.3.DFD Context
One
of
the
DFD
types
that
is
going
to
be
used
in
this
thesis
is
the
Context
Diagram (DFD Context). Wilkinson et al. (2000, p. 122) define it as the top level
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of a set of logical DFDs, since the process in encompassed within a single circle.
According to Romney and Steinbart (2006, p. 66), it provides the reader with the
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