BSD-MarkingScheme-June2004-FinalGM

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					             NCC INTERNATIONAL ADVANCED DIPLOMA
                             IN
                      COMPUTER STUDIES

                          BUSINESS SYSTEMS DESIGN

                                        6th June 2004




                                   MARKING SCHEME


Markers are advised that many answers in Marking Schemes are examples only of what we
might expect from candidates. Unless a question specifically states that an answer is demanded
in a particular form, then an answer that is correct, factually or in practical terms, must be given
the available marks.

If there is doubt as to the correctness of an answer the relevant NCC textbook should be the first
authority.

This Marking Scheme has been prepared as a guide only to markers. This is ABSOLUTELY
NOT a set of model answers; NOR is the Marking Scheme exclusive, for there will frequently
be alternative responses which will provide a valid answer.




                                       Notice to Markers

  Where markers award half marks in any part of a question they should ensure that the
             total mark recorded for a question should be a whole mark.




Business Systems Design           HW        June 2004    30/03/04       Final         NCC Education Ltd 2004
                                     ANSWER ANY FIVE QUESTIONS

QUESTION 1                                                                                                      Marks
Throughout the question, please credit any valid alternative point.

a)   In the measurement of risk related to a computer system, explain E = I x N.                                      5
     Allocate 1 mark for the correct identification of each component of the formula and 2 marks for a
     suitable explanation.

     E is the monetary value
     I is the financial impact of the threat
     N is the number of expected occurrences per year

     By using the formula it is possible to quantify the overall cost that a specific threat has on an
     organisation.

b)   Briefly describe the FOUR main objectives of recovery procedures.                                                8
     Allocate up to 2 marks for each of the following:

     Availability – Here, the objective is to increase the mean time between failures and reduce the time it
     takes to recover from failures in order to increase overall system availability. Increasing availability
     will depend on the type of failure being anticipated by the system designer and on adequately
     documented and recognised recovery procedures having been established.

     Graceful degradation – Rather than have the failure of one component cause the complete collapse of
     the entire system it is generally preferable for the system to remain available but with a reduced level of
     service. Such a reduction in service may mean slower response time, a decrease in throughput, or the
     reduction in the number of functions available within a given system.

     Fail-safe – When the systems fails it should not lead to any threats to security. It should be designed so
     that it does not go out of control or leave the system open to abuse. For example, restart procedures
     when printing accountable document should not provide the opportunity for the operator to by-pass the
     normal control procedures.

     Rapid recover capability – Whenever the system fails, and whatever the cause, it must always be
     possible to recover from the situation – and speed in recovery is essential.

c)   Briefly state FOUR possible examples of how stand-by facilities could be provided to cater for the               4
     complete loss of computer systems.
     Allocate ONE mark for each of the following:
     • Making use of another geographically remote site within the company.
     • Ensuring that there is an agreement with the manufacturers for rapid replacement of the lost
         hardware.
     • Agreement with another company to rent time on their equipment.
     • A comprehensive disaster recovery contract with a purpose built stand-by centre.

d)   Briefly describe THREE security issues related with using the Internet.                                          3
     Allocate ONE mark for each of the following:
      • Viruses, particularly when dealing with attachments to e-mail or downloading software.
      • Viewing active content, the executable files used to produce animated sequences on a web site.
      • Protecting the organisation’s corporate network from anyone attempting to access it via the
         Internet

                                                                                                      Total 20 Marks

Business Systems Design             HW           June 2004        30/03/04      Final       NCC Education Ltd 2004
QUESTION 2                                                                                                 Marks
Throughout the question, please credit any valid alternative point.

a)   Briefly describe FOUR main objectives which should be considered when designing an office layout.             4
     Allocate 1 mark for each of the following:
     • To keep staff movement to a minimum in performance of such tasks as passing on work and
         accessing manual files.
     • To make supervision easy, often a difficult compromise between being at a practical distance for
         observation and sitting too close.
     • To reduce environmental interference such as noise, whilst maintaining good health and safety
         conditions.
     • To take account of likely expansion or other changes outside the control of the system.

b)   What are the THREE key questions that an analyst/designer must ask when designing a form?                     3
     Allocate 1 mark for each of the following:
     • What will the form be used for?
     • Where will the form be completed?
     • How many procedures must the form pass through?

c)   Briefly describe the THREE levels of control essential for any system.                                        6
     Allocate up to 2 marks for each of the following.
     • Management control is used to ensure the success of the system in meeting its business objectives.
         It does this by specifying reports and control information to be provided for managers and by
         ensuring that these reports are acted upon effectively.
     • Audit control is required by law to protect the interests of a company’s shareholders. Its aim is to
         impose financial and procedural controls in order to safeguard the company’s assets and ensure
         the accuracy and reliability of company records.
     • Organisational control is concerned with the control of people in the performance of their work, to
         ensure accuracy of the system and to prevent fraud.

d)   i)   Briefly identify THREE human factors that should be considered, when designing clerical                  3
          procedures?
          Credit any three of the following points with appropriate explanations with 1 mark each:
          • How much independent action are clerical workers to be allowed?
          • How much variety will there be in their work?
          • Is there an opportunity for forming work groups?
          • How much responsibility is involved in this work?
          • What differentiation is there in job responsibility and does this make for a sensible promotion
              scheme?

     ii) State FOUR fall back procedures that may be available to a company running a computer system.             4
         Allocate 1 mark for any 4 of the following:
         • Reciprocal agreement with another company.
         • Duplication of key items of equipment.
         • The ability to run on a degraded system.
         • Reversion to an older system.
         • Use of a specially developed manual system.

                                                                                                 Total 20 Marks




Business Systems Design             HW        June 2004     30/03/04       Final         NCC Education Ltd 2004
QUESTION 3                                                                                                     Marks
Throughout the question, please credit any valid alternative point.

a)   Produce a diagram which clearly illustrates the various stages of the systems development life cycle in         11
     the correct order.

     The diagram should resemble:




     The diagram should include all eleven stages (5marks)
     The stages should be in the correct order (5 marks)
     And should show a cyclic approach (1 mark)

     If the stages are just listed – allocate 5 marks.




Business Systems Design              HW         June 2004    30/03/04        Final         NCC Education Ltd 2004
                                                                                                            Marks

b)   Briefly describe SIX advantages of using the structured specification approach over the traditional wordy      6
     report for presenting information about a systems design.
     Credit any 6 of the following points with 1 mark each:
     • The use of graphics allows system design to be depicted more easily than with reams of text.
     • Systems development may be partitioned to allow separate teams to work on individual modules of
         the design.
     • A top-down approach ensures that major aspects of the system are given the highest priority.
     • Structured specifications enable systems to be more easily maintained due to the disciplined
         approach to design stages.
     • Iterative techniques are used to repeat processes and procedures to ensure all faults are found.
     • Structured specifications are easily understandable as they follow clearly defined approaches.
     • The use of a logical model enables the designer to avoid physical considerations until the analysis
         is complete.
     • Structured specifications are more precise and concise and therefore easier to read.

c)   Briefly state the THREE primary objectives of any design exercise.                                             3
     Allocate 1 mark for each of the following:
     • Flexibility – How easy it will be to incorporate future changes in requirements?
     • Performance – How quickly will the system be able to perform the required functions?
     • Control – How secure is the system against human error, machine malfunction or deliberate
         misuse?

                                                                                                   Total 20 Marks




Business Systems Design             HW        June 2004     30/03/04        Final         NCC Education Ltd 2004
QUESTION 4                                                                                                Marks
Throughout the question, please credit any valid alternative point.

a)   Document a manual procedure for “Preparing a meal in a microwave oven” by producing the following:
     i) A set of step-by-step written instructions.                                                               6
        There is no standard answer to this question. However, provided that the candidate produces a
        detailed set of instructions which follow a logical and valid sequence for preparing a meal in a
        microwave oven then marks should be awarded, maximum 6 marks.

     ii) A Data Flow Diagram (DFD).                                                                               8
         There is no standard answer to this question. The candidate should produce a suitable Data Flow
         Diagram that depicts a logical procedure. Award marks for producing a logical DFD with correct
         use of DFD processes, access paths, events, effects and entities, maximum 8 marks.

b)   Briefly describe THREE considerations that the designer should take into account when designing online       6
     programs.
     Allocate up to 2 marks for any three of the following:
     • Select first the most critical modules on the basis of response-time requirements and transaction
         volumes, consider the performance expected against the business requirements and optimise the
         design to meet the necessary levels of performance.
     • Ensure that operations concerning the human-computer interface (detailed screen menus and
         dialogues) and logic for data manipulation and storage are not overlooked.
     • Create additional logic which may be necessary to handle temporary data stores.
     • Create additional logic necessary to handle backup, recovery and security aspects of the system.

                                                                                                Total 20 Marks




Business Systems Design            HW        June 2004     30/03/04       Final         NCC Education Ltd 2004
QUESTION 5                                                                                                 Marks
Throughout the question, please credit any valid alternative point.

a)   Write brief notes (approximately 200 words) which describe the composition and role of a steering            6
     committee.
     Whilst there is not single standard answer to this question marks should be awarded for responses
     which include each of the following points:

     Composition
     • Management or executive sponsor. [1]
     • User department representatives. [1]
     • IT department representatives. [1]

     Role
     • Determine the viability of the project. [1]
     • Discuss and ratify any organisational changes for the new system. [1]
     • Assess the scope of any impact that the new system will have on the organisation. [1]

b)   In the design of a new system, certain issues related to testing should be considered by the designer.       4
     Briefly describe TWO of these issues.
     Credit 2 marks each for the following:
     • He/she must ensure that the system is designed in such a way that it can be tested, and will usually
          have responsibilities which extend to system testing after the system has been built/coded.
     • He/she may use prototyping and limited trials during design, to test the design approach for
          practicality.

c)   Identify and explain the THREE key aspects of job design which need to be considered when developing         6
     new systems.
     Credit any of the following points with appropriate explanations with 2 marks each:
     • Identify all tasks, old and new, which will undergo change as a result of the new system.
     • Generate alternative ways of allocating tasks to jobs by considering, for example, allocations by
         function, product or customer.
     • Provide opportunities for user groups to explore job tasks by providing prototypes of the main
         functions of the new system.

d)   Briefly describe the techniques that can be used to identify potential users of systems.                     4
     Allocate 1 mark for each of the following points:
     • Start by establishing the name and job titles of the user of the existing system if applicable.
     • Develop a ‘map’ of the current user population.
     • Classify future users in terms of primary, secondary or tertiary users.
     • Use the ‘map’ as a directory of potential users when user needs and characteristics have to be
         established at various points in the development.

                                                                                                  Total 20 Marks




Business Systems Design            HW        June 2004     30/03/04       Final         NCC Education Ltd 2004
QUESTION 6                                                                                                  Marks
Throughout the question, please credit any valid alternative point.

a)    Explain why it is best to avoid certain characters such as the letters ‘O’ and ‘I’ when generating mixed      4
      alphanumeric codes.
      Allocate the full 4 marks for any explanation which includes all the following details:
      • When it is necessary to use an alphanumeric random code structure, characters that are easily
          misread should be avoided.
      • For example, the letter ‘I’ can be mistaken for the number one (‘1’) or ‘/’ symbol,
      • The letter ‘O’ can be confused with the number zero (‘0’), the letter ‘Z’ may be interpreted as the
          number two (‘2’).
      • Similarly, certain letter combinations may be confused with one another, for example, O and Q, U
          and V, or A and H.

b)    Briefly state FOUR reasons why it might be necessary for a company to introduce a new coding system.          4
      Allocate 1 mark for any 4 of the following:
      • An entirely new system is being introduced.
      • An existing code has been outgrown and cannot be extended.
      • Two organisations merge and require a common coding system.
      • The basic original requirements for an existing code have changed.
      • The introduction of new technology such as barcode readers.
      • Government legislation forces the use of a new coding structure.




Business Systems Design             HW        June 2004     30/03/04        Final         NCC Education Ltd 2004
                                                                                                          Marks

c)    The diagram below shows an example of a barcode. Provide appropriate labels for each of the elements        6
      marked A through F.




      Allocate 1 mark for each correct label as follows:




d)    Identify SIX characteristics of a good code.                                                                6
      Allocate 1 mark for any SIX of the following:
      • Uniqueness
      • Expandability
      • Conciseness
      • Uniform size and format
      • Simplicity
      • Versatility
      • Sortability
      • Stability
      • Meaningfulness
      • Operability

                                                                                                Total 20 Marks




Business Systems Design             HW        June 2004    30/03/04       Final         NCC Education Ltd 2004
      Question        Objective        Marks               Student
                                                         workbook
                                                          Page no.
      1 a)                  H            5                     219
        b)                  H            8                     222
        c)                  H            4                     224
        d)                  H            3                     230

      2 a)                  F            4                      167
        b)                  C            3                      170
        c)                  C            6                  170-171
        d) i)               F            3                  168-169
        d) ii)              D            4                  172-173

      3 a)                  B           11                         2
        b)                  B            6                      9-10
        c)                  B            3                       3-6

      4 a) i)               D            6                  175-177
        a) ii)              D            8                  153-154
        b)                  D            6                  156-157

      5 a)                  A            6                     13-14
        b)                  A            4                        17
        c)                  A            6                        16
        d)                  A            4                        16

      6 a)                  G            4                      148
        b)                  G            4                      129
        c)                  G            6                      143
        d)                  G            6                  144-145




Business Systems Design           HW         June 2004   30/03/04      Final    NCC Education Ltd 2004

				
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