April 1999
SD206: SYSTEMS DESIGN

QUESTION 3

Total Marks: 20 Marks

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SAMPLE STUDENT'S SOLUTIONS
for Question 3

 
(a) (i) Describe two hidden costs which can be reduced by using electronic forms. [4]
(ii) List two drawbacks of using electronic forms.

 

 [2]
(b) Describe, using examples, each of the following types of code.
(i) Significant-digit subset codes. [2]
(ii) Cipher codes. [2]
(iii) Sequence codes.

 

 [2]
(c) Give one example of how each of the following guidelines can aid coding. [1]
(i) "Avoid confusing codes". [1]
(ii) "Keep codes concise". [1]
(iii) "Keep codes stable".

 
(d) Give one example of each of the following means of validating input data.
(i) Test for reasonableness. [1]
(ii) Test for invalid values. [1]
(iii) Test for comparison with stored data.

 

 [1]
(e) When is the check digit approach useful? [2]