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ICT2621 ASSIGNMENT 3 2023
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ASSIGNMENT 03 Study material: Prescribed book chapters 5, 8, 9, 11 and 12 Excluded: Objected-oriented analysis and design sections Assignment type: Written
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ICT2621/101/3/2023ASSIGNMENT 03
Study material: Prescribed book chapters 5, 8, 9, 11 and 12
Excluded: Objected-oriented analysis and design sections
Assignment type: Written
Submission procedure: Via myUnisa on the indicated due date on the module site
Year-mark weight: 60%
Compulsory: It contributes towards the year mark.
Submit your assignment via myUnisa by the due date. Do not be concerned if
myUnisa is down on the last submission date. We are notified when this happens,
and will take this type of delay into consideration.
Provide detailed solutions to all the questions. The solutions of the questions will be
uploaded on myModule site as Tutorial Letter 202
The mark that you achieve will contribute 60% towards your semester mark.
Total: 100 mark
ASSIGNMENT 03 2023, Total: 100 marks
Chapter 5 – Data and process modelling
Question 1 [21]
NB: When drawing data flow diagrams (DFDs), use the Gane and Sarson
symbols/notation set.
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)
1.2 Briefly describe the following with respect to DFDs:
1.2.1 Levelling (2)
1.2.2 Balancing (2)
1.2.3 Data dictionary (2)
, 1.3 Draw a diagram of an example of each of the following showing the process, and the
input(s) and output (s), where applicable. You should name each process, input or
output used. Do not use the examples from the prescribed test book; rather use them
as guidelines.
1.3.1 Spontaneous generation (3)
1.3.2 Black hole (3)
1.3.3 Gray hole (3)
NB: Questions 1.4 to 1.7 below are self-assessment exercises. Attempt the questions but
DO NOT submit answers for marking. Solutions to these questions will appear in Tutorial
Letter 202.
1.4 What are the six guidelines for drawing DFDs? (--)
1.5 Define Structured English and list its guidelines. (--)
1.6 Draw the context diagram of the Order System provided in Figure 5-11 on page 155
of your prescribed book. Using this diagram, explain what the system does. In your
explanation, include what the Order System sends or receives from each of the
external entities. (--)
1.7 Use the two diagrams in Figure 5-12 on page 156 of the prescribed book to explain
the difference and similarities between a context diagram and diagram 0. Here we are
interested in the general differences or similarities between the a context diagram and
diagram 0; you can use Figure 5-12 as the point of reference, if you need to provide an
example.
Chapter 8 – User Interface design
Question 2 [13]
2.1 As a systems analyst, when designing systems, one of your goals should be to build
systems that are effective, reliable and maintainable. Briefly explain each of these three
factors. (6)
2.2 What is Human-Computer Interaction (HCI)? (2)
2.3 What are the seven habits of successful interface designers? (4)
2.4 Use the internet to find the ISO 9241-11 standard definition of usability with respect
to computer interfaces. (1)
NB: Questions 2.5 below is a self-assessment exercise. Attempt the question but DO
NOT submit answers for marking. The solution to this question will appear together with
the solution for this assignment. (--)
2
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