April 2000
SD206 : SYSTEMS DESIGN

QUESTION 1 (Compulsory)

Total Marks: 30 Marks

• Question 2
• Question 3
• Question 4
• Question 5
• Cover Page

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SUGGESTED SOLUTIONS
for Question 1

(a)List the six steps which are necessary for deriving a structure chart from a leveled set of data flow diagrams.[6 marks ]

(b)Explain how internal receivers differ from external receivers.... [2marks ]

(c)List two visible costs of paper forms.[2 marks ]

(d)Define the term direct manipulation interface.... [2marks ]

(e)List two factor that may assist in ensuring a high quality of data capture. [2 marks ]

(f)Describe the following types of controls
(i)Processing controls.[2 marks ]
(ii)Audit trails.[2 marks ]

(g)(i)Why should analysts acknowledge that it is impossible to totally avoid
errors?[1 mark ]
(ii)What is error detection and correction [2marks ]
(iii)What is error tolerance [1mark ]

(h)(i)When do organisations get the most benefit from CASE technology?[1 mark ]
(ii)Why should selecting a methodology be the first step in implementing
CASE?[1 mark ]

(i)(i)What is modular conversion [1mark ]
(ii)Give two disadvantages of modular conversion.[2 marks ]
(iii)How does phase-in conversion differ from modular conversion?[1 mark ]
(iv)Give two advantages of phase-in conversion.[2 marks ]