A picture of the movement of data between external
entities and the processes and data stores within a system
2) what are the Data Flow Symbols ?
A) Data Store
a) File folder
b) Computer-based file
c) Notebook
B) Process
Depicts work or action performed on data so that they are transformed, stored or distributed
Number of process as well as name are recorded
C) Data flow: arrows depicting movement of data
D) Source/Sink
a) Depicts the origin and/or destination of the data
b) Sometimes referred to as an external entity
c) Drawn as a square symbol
d) Name states what the external agent is
e) Because they are external, many characteristics are not of interest to us