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GCSE ICT

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iolana
17 diapositives · 357 Views · Sep 09, 2014

GCSE ICT. What is an Information System?. What is data?. DATA is raw facts and figures. These have very little meaning until they are sorted or they are used to make calculations. The process of sorting or calculation data is called DATA PROCESSING.

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GCSE ICT
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  1. GCSE ICT What is an Information System?

  2. What is data? • DATA is raw facts and figures. • These have very little meaning until they are sorted or they are used to make calculations. • The process of sorting or calculation data is called DATA PROCESSING. • The result of data processing is INFORMATION.

  3. Data Processing Data is processed Data Information

  4. Information • INFORMATION is the meaning that we attach to data. • Without processing or additional information, data is often meaningless.

  5. Information • For example: What does the number 29061996 mean? • Is it: • A birthday? (29th June 1996) • A bank account number? • A club membership number? • A telephone number? • Without processing or more information this data is meaningless.

  6. The three stages of doing tasks Input Process Output • Data is put into the information system. (INPUT) • The data is processed. (PROCESS) • Information comes out of the information system. (OUTPUT)

  7. Manual information systems • We are all used to using manual information systems. • An example of a manual information system is a telephone directory.

  8. Manual information systems • All we need to know to find a person’s telephone number in the telephone book is their name and address. (INPUT) • We look up the name and the address (PROCESS), and we find their telephone number. (OUTPUT)

  9. Manual information systems Input Process Output • Have the name and address. (INPUT) • Look up the name and address. (PROCESS) • Find the telephone number. (OUTPUT)

  10. Manual information systems • However, if the name is a common one or the address is incomplete, the process of finding the telephone number becomes more difficult. • This is because the telephone directory is organised alphabetically by surname, first name, and address.

  11. Manual information systems • If you have just the name and telephone number, can the telephone directory be used to find someone’s address? • If you have just a telephone number, can the telephone directory be used to find someone’s name and address? • Manual information systems do have disadvantages.

  12. Computerised information systems • Computerised information systems have several advantages over manual information systems. • These include: • Greater flexibility • Speed

  13. Examples of computerised information systems - 1 • DVLA – Driver Vehicle Licensing Authority • The DVLA has a computerised database about every driver and vehicle in the UK. • This database can be used to find information about a vehicle or driver even if the data is incomplete.

  14. Examples of computerised information systems - 2 • SIMS – School Information Management System • The SIMS system (or something like it) is used in most schools in the UK. • It can be used to perform a large number of different tasks using the data stored within its databases.

  15. Examples of computerised information systems - 2 • These tasks include: • Recording individual pupil attendance • Storing a pupil’s personal details (including home address and telephone number, date of birth, emergency contact numbers, medical conditions) • Producing class and group lists for teachers • Collating a pupil’s annual school report

  16. Advantages of computerised information systems • A single computer can store all the information needed. • By using several terminals different people can access information at the same time. • Information is not duplicated. • Information can be transferred to other computer systems easily.

  17. Disadvantages of computerised information systems • If the computer is not working information can not be added, processed or accessed. • Users have to be trained. • The computer system must be secure.