42
The symbols are as follow
6
:
Symbols
Meaning
External Agent
The sources or destination of data outside the system.
Data Flow
Data flowing
from
place to place,
such as an
input or output
to a
process.
Process
Step-by-step
instructions are
followed that
transform
inputs
into
outputs (a computer or person or both doing work).
Data Storage
Data
at
rest,
being
stored
for
later
use.
Usually
corresponds
to a
data entity on an entity relationship diagram.
Table 2. 1 Data
Flow Diagram Symbol (Satzinger,
pg.202)
6
Satzinger, John B., Jackson, Robert B., Burd, Stephen D. 2007,
’The Traditional Approach to
Requirement ’, in System Analysis and Design in a Changing World, Thomson Course Technology, United
States of America, pp 202.
 |