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IT revision - Coggle Diagram

- - - - Raw facts and figures
      - No meaning
    - - Data has been given meaning
      - We understand what it is about
    - - Data + Context + Structure = Information
  - - - Alphanumeric
        
        Letters and Numbers only
      - Numeric
        
        Currency
        
        Money
        
        Intergar
        
        Whole Numbers only
        
        Stores a number in a variety of ways
        
        Real
        
        An approximation of a real number
        
        Decimal
        
        Any decimal number
        
        Percentage
        
        A percent out of 100%
      - Boolen
        
        Only 2 responses
      - Date and Time
        
        Stores a range of date and time formats
      - Text
        
        Stores any possible character
    - - Data Type Check
        
        Checks that the data has been entered using the correct type
        
        EG: A Boolean data type will not accept "X"
      - Format Check
        
        Checks the data entered in the expected formatt
        
        EG: if it was date does it follow DD/MM/YY
      - Input Mask
        
        Is it being entered in the expected way? helps input data into the correct format
        
        EG: Most postcodes look like LLNN NLL
      - Length Check
  - - - Extreme Data
        
        On the boundary of being invalid - should be accepted
      - Invalid/Erroneous Data
        
        Data that is incorrect, product should reject it automatically
      - Valid Data
        
        Data that is correct, should be accepted
    - - User Testing
        
        Advantages
        
        User Feedback helps develop a product
        
        No specific workplace needed
        
        Can check how long it completes tasks
        
        Can see how happy users are with a product
        
        Disadvantages
        
        Takes time to test with a range of users
        
        Costs Money to run the tests and pay the users
        
        Does not find technical errors
      - Technical Testing
        
        Advantages
        
        Spot errors early in development
        
        Helps measure progress early on an product
        
        Identifies problems so solutions can be found
        
        Disadvantages
        
        Takes time to test fully
        
        Problems can delay the product
- - - - Virus
        
        Makes copies of itself by attaching itself to another program
        
        Can damage or destroy files, if on a network it can spread to all connected devices
      - Worm
        
        Makes Copies of itself and spreads though the device
        
        Damages and deletes files
    - - Baiting
        
        Victim is offered something appealing in return for giving away their information
      - Quid Pro Quo
        
        Calling random phone numbers and pretending to offer help often IT Support to persuade the victim to give their details
      - Pretexting/blagging
        
        Trying to get someone to give their information by pretending they need to confirm their identity
  - - - Data that is changed by the hacker, spotted quickly
    - - Data is changed to be used for a different purpose
    - - The data is destroyed
    - - Data is stlen by the hacker
    - - Users cannot access the system - basically a DDOS attack
    - - Personal identity stolen - hacker then usually commits identity fraud
- - - - Retail
        
        Purpose: used by both the business and the customer
        
        Advantages: Can track stock and sales, helps stop staff making mistakes
        
        Disadvantages: Takes times and money to set up
      - Home Appliances
        
        Purpose: HCI used with appliances around the house
        
        Advantages: Easy to control the appliance
        
        Disadvantages: Can't update easily, Appliances need to be replaced regularly
      - Fitness
        
        Purpose: Use sensors and touchscreens to monitor your fitness
        
        Advantages: Easier to use touchscreen when exercising
        
        Disadvantages: Can be a cost to use
      - Banking
        
        Purpose: Use menus to access the account and get money
        
        Advantages: More Secure, Less chance of mistakes
        
        Disadvantages: Costs of updates, accessibility issues
      - Embedded Systems
        
        Purpose: The HCI is part of another system
        
        Advantages: Cheap to build, doesn't need lot's of processing power
        
        Disadvantages: Can't easily be fixed if there is a problem
      - Entertainment
        
        Purpose: TVs, Consoles, mobile devices, Access using menus
        
        Advantages: Can be customised, portable access to content
        
        Disadvantages: Cost to access the content, need internet to access the content
- - - - Flowchart
        
        Shows a clear path of how you will achieve an intended product
        
        Disadvantages: Can become complicated and hard to understand
        
        Advantages: Good at showing a clear route, helps with being organised
      - Wireframe
        
        Shows what a product will look like, annotated to add basic style information (Colours, fonts, etc.) and navigation
        
        Disadvantages: Shows what will be created, Easy to edit after feedback
        
        Advantages: Doesn't include technical information, Not suitable for non-static products
      - Mindmap:
        
        Visually shows ideas and the link between them
        
        Disadvantages: Limited text can be included, takes time to make, can be hard to understand if badly structured
        
        Advantages: Condenses down information, Helps focus on the links between ideas, Easy to add to
      - Visualisation Diagram
        
        Plans the visual layout of a product, annotated to explain the details
        
        Disadvantages: Not suitable for non-static products, not suitable for large products, Different people may interpret it differently.
        
        Advantages: Easy to understand, Easy to edit, You can comment on common patterns to avoid repeating yourself