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GCE JAN 2009 : A2 1 Development of Information Systems

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ADVANCED General Certificate of Education January 2009 Information and Communication Technology assessing Module 4: Development of Information Systems A2W11 Assessment Unit A2 1 [A2W11] FRIDAY 16 JANUARY, MORNING TIME 1 hour 30 minutes. INSTRUCTIONS TO CANDIDATES Write your Centre Number and Candidate Number on the Answer Booklet provided. Answer all seven questions. INFORMATION FOR CANDIDATES The total mark for this paper is 90, including a maximum of 4 marks for quality of written communication. Figures in brackets printed down the right-hand side of pages indicate the marks awarded to each question or part question. 4296 Answer all seven questions. 1 A software system can be bought off-the-shelf or outsourced to ICT consultants. (a) Compare these two methods of producing a software system using the following headings. (i) Cost [3] (ii) Implementation time [3] (iii) Suitability [3] (b) Name and describe one other method of obtaining a software system. 2 [3] (a) Explain why protocols are required for data communication. [2] (b) Briefly describe the following network protocols. (i) CSMA/CD (ii) TCP/IP [6] (c) Compare co-axial cable and fibre optic cable with regard to: (i) Data transfer capacity. (ii) Signal interference. 3 [4] A range of factors can influence human computer interaction (HCI). (a) Describe three physical factors which can influence HCI. (b) Describe two psychological factors which can influence HCI. 4296 [6] [6] 2 [Turn over 4 An organisation with a number of branches worldwide uses a distributed database. (a) Describe two advantages of a distributed database over a centralised database. [4] (b) Describe two disadvantages of a distributed database over a centralised database. [4] Access to the database is restricted using access levels and audit trails. (c) Apart from read only, name and describe two other access levels. (d) Identify four activities recorded by an audit trail. 5 [4] [4] A project manager is appointed for a new information system. (a) Describe the role of a project manager. [5] (b) Describe how each of the following CASE tools could be used in the development of the new system. (i) A modelling tool (ii) A data dictionary generator (iii) A code generator 6 [9] A new information system undergoes testing. (a) Explain what is meant by each of the following. (i) Alpha testing. (ii) Beta testing. [6] (b) After the system has been in use for some time, one of the software modules has to be [4] modified. Describe the testing which will be required in this case. 4296 3 [Turn over 7 The following entity relationship (ER) model was produced during the design of a car assembly system. Component Car Before the model can be implemented as a relational database, the relationship must be modified. (a) Explain, with the aid of a diagram, how the relationship should be modified. [4] (b) Describe how the entities in the modified ER model could be used to create a relational database. [6] 935-066-1 4 [Turn over

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Additional Info : Gce ICT January 2009 Assessment Unit A2 1, Module 4: Development of Information Systems
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