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(a)Describe,using
examples,two coding methods.[6 marks ]
One mark
should be awarded foreach coding method named (up to a maximum of
two marks), with, in each case, one mark available for a satisfactory
elaboration and one mark available for a suitable example. Acceptable
coding methods are as follows:
• Classification codes.
• Function codes.
• Sequence codes.
• Significant digit subset codes.
• Mnemonic codes.
• Cipher codes. [6 marks ]
(b)List three general guidelines for
coding.[3 marks ]
One mark should be awarded for each guideline named (up to a maximum
of three marks). Examples include the following:
• Keep codes concise.
• Keep codes stable.
• Make codes that are unique.
• Allow codes to be sortable.
• Avoid confusing codes.
• Keep codes uniform.
• Allow for modification of codes.
• Make codes meaningful. [3 marks ]
(c)Calculate the following:
(i)The Check Digit of 32874 using Modulus 10 with a 2-1-2 weighting
[2marks ]
1
One mark should be awarded for correctly applying the technique, and
a further mark should be awarded for deriving the correct answer.
[2 marks ].
(ii)The Check
Digit of 32874 using Modulus 10 with a 3-1-3 weighting. [2 marks ]
6
One mark should be awarded for correctly applying the technique, and
a further mark should be awarded for deriving the correct answer.
[2 marks ]
(iii)The Check Digit of
32874 using the Modulus 11 “geometric” technique [2marks]
3
One mark should be awarded for correctly applying the technique, and
a further mark should be awarded for deriving the correct answer.
[2 marks ]
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