ICT UNIT 3

ICT UNIT 3

Encoding Data
1. Saves time
  1. encoded data is quicker
2. Less storage space
  1. Fewer characters
  2. Faster
3. Less chance of human typographical error
Storing data using ICT
1. Advantages
  1. Cheaper
    1. Less money spent on overheads
      1. No filing cabinets
  2. Easier and quicker to transfer and back up data
2. Disadvantages
  1. Training will be needed
    1. Expensive
  2. Transferring data is a security risk
    1. Protection is needed from hackers
Validation and Verification
1. Batch Total
  1. Checks something isn't missing
    1. Adding together a number field in different records and checking totals
      1. Invoice adding 1,2,3 the computer will look for a BATCH of 6
2. Hash
  1. Same as Batch but field checked is meaningless
    1. Company has 3 customers with numbers ending in 2, 3, 4. Computer looks for a hash total of 9
3. Validation
  1. Only sensible data entered
4. Verification
  1. Errors when copied form one medium to another
  2. Double Keying
    1. Data Entered twice
      1. Passwords
  3. Visual Check
    1. Proofreading
      1. Looking over a CV before sending
  4. Parity
    1. Checks that data is correct when sent
      1. Uploading files to a website
Transcription
1. Erros occur when copying data to computers
  1. Bad Handwriting
Transposition
1. Errors can happen when characters are swapped
  1. Pressing 'Q' instead of 'W'
Control Systems
1. Security Systems
  1. PIR sensors
2. Automatic Doors
3. Traffic Control
4. Car Parking
5. Greenhouses
6. Robotics
7. Stimulation
Data Logging
1. Advantages
  1. More Accurate
  2. No-one will forget a reading
2. Disadvantages
  1. Equipment can be expensive
  2. Could go wrong
Control Systems
1. Advantages
  1. Robots can be put in dangerous situation
    1. Don'y need to take breaks
2. Disadvantges
  1. Human jobs lost
  2. Expensive to repair

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	Created by Ellie Dukes over 10 years ago