Why Computer Studies


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Why Computer Studies

  1. 1. Why Computers?<br />
  2. 2. Introduction/Objectives<br /><ul><li>In this topic we look at three things:
  3. 3. The core uses of ICT
  4. 4. How the response speed of ICT systems facilitates the use of feedback
  5. 5. The current limitations of ICT</li></li></ul><li>Core Uses of ICT<br /><ul><li>There are six things ICT is good at or sixcore uses of ICT that make it valuable to organisations:</li></li></ul><li>Repetitive Calculation<br /><ul><li>Computers can carry out millions of repetitive calculations per second – something that would be very labour intensive and costly without computers.
  6. 6. Banking
  7. 7. Utility Billing (gas etc.)
  8. 8. Research
  9. 9. Payroll
  10. 10. With a computer it doesn’t matter if it is </li></ul>ten calculations or ten million – it costs the same.<br />
  11. 11. Vast Storage Capacity<br /><ul><li>Computer systems store 100s billions of data items. With the large capacity of modern hard drives, vast amounts of data can be stored electronically.
  12. 12. Banking records
  13. 13. Customer databases
  14. 14. Stock control
  15. 15. Government databases
  16. 16. Internet</li></li></ul><li>Searching and Sorting<br /><ul><li>Computer databases allow us to retrieve related information quickly and accurately.
  17. 17. Banks
  18. 18. Billing Systems
  19. 19. Police databases
  20. 20. Online Retailing
  21. 21. Stock Control
  22. 22. Are there any other examples you can think of?</li></li></ul><li>Combining Data<br /><ul><li>Computer analysis of data can show up patterns and trends not previously seen or impossible to see without vast processing power
  23. 23. Satellite Imaging
  24. 24. Medical Research
  25. 25. Scientific Research
  26. 26. Police databases (e.g. HOLMES 2)
  27. 27. Astronomical Research
  28. 28. Market Research</li></li></ul><li>Communications<br /><ul><li>In recent years computers have revolutionised the world of communications so much a C was added to IT!!!
  29. 29. Internet
  30. 30. Cell Phones
  31. 31. Digital Broadcasting
  32. 32. Satellite communications
  33. 33. Global Positioning System (GPS)
  34. 34. Don’t forget ICT doesn’t just refer to desktop computers!</li></li></ul><li>Fast Response Times<br /><ul><li>Allows ‘real time’ feedback
  35. 35. Retail Systems
  36. 36. Banking (e.g. ATM)
  37. 37. Computer Games
  38. 38. Systems Control
  39. 39. Ticket Booking systems
  40. 40. Medical monitoring</li></li></ul><li>Feedback<br /><ul><li>Feedback = Output affects Input
  41. 41. Example 1 - Stock Control
  42. 42. Sufficient stock must be kept to satisfy customers but…
  43. 43. Storage of large levels of stock is expensive
  44. 44. The ICT system continually adjusts stock levels to make JIT orders of stock
  45. 45. Example 2 – Systems Control
  46. 46. Systems control on a car, aeroplane etc. continually responds to changes in its environment (measured by sensors)
  47. 47. Feedback is only possible because of the response speed of ICT</li></li></ul><li>Dependence on ICT<br /><ul><li>Technology based countries are now almost totally reliant on computers
  48. 48. Even small scale failure can have devastating and costly consequences
  49. 49. Major systems/infrastructure couldn’t function without computers
  50. 50. Water, Gas, Electricity supply
  51. 51. T.V., Radio, Telephony
  52. 52. Food/Fuel transport, Rail, Air, Road travel
  53. 53. Financial Systems</li></li></ul><li>Limitations of ICT<br /><ul><li>Hardware is pushed to its limits
  54. 54. Processor speed, disk capacity, bandwidth
  55. 55. Think about video calls on MSN etc.
  56. 56. Software “bugs” and design flaws
  57. 57. Can make a system fail or behave in an unpredictable way
  58. 58. Systems may be poorly designed and don’t achieve what they set out to do. There are many examples of failure covered in ICT4
  59. 59. Computer output can only be as good as the input
  60. 60. GIGO!</li></li></ul><li>AI (Artificial Intelligence)<br /><ul><li>AI is the goal of computer scientists but…
  61. 61. Many tasks that humans find easy are hardest to replicate in computers!
  62. 62. Reading handwriting accurately
  63. 63. Interpreting images
  64. 64. Adapting to new environments </li></li></ul><li>GCE Computer Studies 7010<br />Cambridge O Level Computer Studies Syllabus code 7010<br />Candidates take Paper 1, and either Paper 2 or Paper 3. <br />Candidates must be entered for one of the following options:<br />Option 1: Paper 1 and Paper 2<br />Option 2: Paper 1 and Paper 3<br />
  65. 65. How GCE - Computer Studies Is Helpful For Students?<br />encourages students to develop lifelong knowledge and skills, including:<br />confidence in the use of computers<br />an appreciation of the broad range of <br /> computer applications<br />a balanced understanding of the power and <br /> versatility of the computer and the benefits <br /> of its use alongside its limitations and potential disadvantages.<br />Cambridge O Level Computer Studies is an ideal foundation for further study at A Level, and the skills learnt can also be used in other areas of study and in everyday life.<br />
  66. 66. Continued ……<br /><ul><li>develop the ability to solve problems using computing techniques
  67. 67. develop an awareness of the place of computing in society and issues computing raises in society</li></li></ul><li>
  68. 68. Components Description<br />Paper 1<br />This is a compulsory question paper, consisting of short-answer and structured questions. Candidates must answer all the questions.<br />
  69. 69. Continued…..<br />Paper 2: Coursework (school-based assessment)<br />The purpose of this project is to allow candidates to demonstrate their ability to undertake a complex piece of work, which is a computer-based solution to a significant problem, and to complete the solution and present their results. A complex piece of work is one which involves one of the following:<br />integrating components of two generic application packages to form a single solution<br />using some of the more advanced functionality of a single application package<br />using modules and file handling in a coded solution.<br />In all cases, candidates must fully document the solution.<br />
  70. 70. Continued…..<br />Paper 3: Alternative to Coursework<br />This paper consists of short-answer and structured questions which refer to a given scenario. Candidates must answer all the questions. There is a maximum of 60 marks for this paper, but the actual weighting will be 25% to give it the same status as Paper 2 (Coursework).<br />
  71. 71. <ul><li>monthly expenditure using a spreadsheet
  72. 72. a simple hotel booking system
  73. 73. a simple airline booking system
  74. 74. a simple stock control system (e.g. small shop selling CDs)
  75. 75. route planning for a company that has a maximum of 10 routes
  76. 76. automatic stock control systems
  77. 77. a car parts system
  78. 78. library systems
  79. 79. control systems (e.g. chemical plants)
  80. 80. holiday booking company</li></ul>Previous experience of candidates’ work indicates that the choice of certain projects involving games, quizzes, word-processing are unsuitable projects and do not provide the opportunity to achieve high marks.<br />Example Applications<br />!<br />
  81. 81. Revision<br /><ul><li>Use your textbook and Internet sources to make supplementary notes on Capabilities and Limitations of ICT
  82. 82. Choose any real life situation or system e.g. preparing a gas bill. Which of the six capabilities identified in the diagram earlier in this presentation apply to the system</li>