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,CT2621 Assignment 3 (COMPLETE ANSWERS) 202
5 - DUE August 2025; 100% TRUSTED C
Question 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. (9) What is Human-Computer Interaction (HCI)? (3)
What are the seven habits of successful interface designers? (7)
Use the internet to find the ISO 9241-11 standard definition of
usability with respect to computer interfaces. (2) NB: The
following is a self-assessment activity. Attempt the question but
do not submit the answer for marking. The solution will be
made available with the assignment feedback. The most used
forms of output technology for business systems are still in the
form of screen displays and printed matter. List other current
output types and technologies currently available. [30 Marks]
When drawing data flow diagrams (DFDs), use the Gane and
Sarson symbols/notation set. Draw, name and describe the four
symbols used in a data flow diagram (DFD). You may use a table
to present your answer. (12) Briefly describe the following with
respect to DFDs: – Levelling (3) – Balancing (3) – Data dictionary
(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 textbook;
rather, use them as guidelines. – Spontaneous generation (3) –
, Black hole (3) – Gray hole (3) NB: The following are self-
assessment activities. Attempt the questions but do not submit
them for marking. Solutions will appear in Tutorial Letter 202.
What are the six guidelines for drawing DFDs? Define
Structured English and list its guidelines. 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. 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 a context diagram
and diagram 0; you can use Figure 5-12 as the point of
reference if you need to provide an example. [24 Marks]
Scenario: The African Union (AU), at its headquarters in Addis
Ababa in Ethiopia, wants to design a database system for the
people that reside on its continent. As you are aware, Africa is
made up of many countries, and, in general, each country has
many languages that are spoken by the people who live in it.
Many of the languages are spoken across borders. It is also a
known fact that many people in Africa are multilingual. For the
purpose of this question, it will be assumed that each person
resides in one country (i.e. country of main residence) though in
reality, people may be residents or citizens of more than one
,CT2621 Assignment 3 (COMPLETE ANSWERS) 202
5 - DUE August 2025; 100% TRUSTED C
Question 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. (9) What is Human-Computer Interaction (HCI)? (3)
What are the seven habits of successful interface designers? (7)
Use the internet to find the ISO 9241-11 standard definition of
usability with respect to computer interfaces. (2) NB: The
following is a self-assessment activity. Attempt the question but
do not submit the answer for marking. The solution will be
made available with the assignment feedback. The most used
forms of output technology for business systems are still in the
form of screen displays and printed matter. List other current
output types and technologies currently available. [30 Marks]
When drawing data flow diagrams (DFDs), use the Gane and
Sarson symbols/notation set. Draw, name and describe the four
symbols used in a data flow diagram (DFD). You may use a table
to present your answer. (12) Briefly describe the following with
respect to DFDs: – Levelling (3) – Balancing (3) – Data dictionary
(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 textbook;
rather, use them as guidelines. – Spontaneous generation (3) –
, Black hole (3) – Gray hole (3) NB: The following are self-
assessment activities. Attempt the questions but do not submit
them for marking. Solutions will appear in Tutorial Letter 202.
What are the six guidelines for drawing DFDs? Define
Structured English and list its guidelines. 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. 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 a context diagram
and diagram 0; you can use Figure 5-12 as the point of
reference if you need to provide an example. [24 Marks]
Scenario: The African Union (AU), at its headquarters in Addis
Ababa in Ethiopia, wants to design a database system for the
people that reside on its continent. As you are aware, Africa is
made up of many countries, and, in general, each country has
many languages that are spoken by the people who live in it.
Many of the languages are spoken across borders. It is also a
known fact that many people in Africa are multilingual. For the
purpose of this question, it will be assumed that each person
resides in one country (i.e. country of main residence) though in
reality, people may be residents or citizens of more than one
