Exam (elaborations)
ICT2621 ASSIGNMENT 3 SOLUTIONS 2021 SEMEMSTER 1 AND 2
- Institution
- University Of South Africa (Unisa)
ICT2621 ASSIGNMENT 3 SOLUTIONS 2021 SEMEMSTER 1 AND 2
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ICT2621 ASSIGNMENT 3 SOLUTIONS 2021 SEMEMSTER 1 AND 2QUESTION 1
1.1 Draw, name and describe the four symbols used in a data flow diagram (DFD). You
may use a table to present your answer. (6)
Name Draw Describe
Process A process receives input data
and produces output that has a
different content, form, or
both.
Data Flow A data flow is a path for data
to move from one part of the
Information system to another.
A data flow in a DFD
represents one or more data
items
Data Store A data store is used in a DFD
to represent data that the
system stores because one or
more processes need to use the
data at a later time.
External Entity A person, place or thing, or
event for which data is
collected and maintained. A
DFD shows only external
Entities that provide data to
the system or receive output
from the system. A DFD
shows the boundaries of the
system and how the system
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