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system design (4.2 Apply input and output design. (4.2.4 Differentiate…

- - - - Reasonableness check
        
        Def: Identifies values that are questionable, but not necessarily wrong
      - Batch Check
        
        def : Totals used to verify batch input. Batch controls might check data items such as record counts and numeric field totals
      - Combination Check
        
        Def:Performed on two or more fields to ensure that they are consistent or reasonable when considered together.
      - Sequence check
        
        Def: Data must be in predetermined sequence
      - Validity Check
        
        Def: Used for data items that must have certain values
      - Data Type Check
        
        Def: Tests to ensure that a data item fits required data and give an error message if input doesnt match
      - Range Check
        
        Def: Test data items to verify that they fall between a specified minimum or maximum value
        
        eg; the month of a person's date of birth should lie between one and 12
      - Existence check
        
        Def: Used for mandatory data items
        
        automatic computer check and does not check accuracy of data
- - - - Must be accurate,complete,current and secure.
      - Protects privacy rights and sheilds
      - Concern with security issues as they design,implement,and support information system:
    - - The document transfer should be recorded
      - Should have record retention policy
      - Information should be traceable back to the input data it produced
      - Must have procedures for handling source document
- - - - understand the business
        
        business function & system supports
      - maximize graphical effectiveness
        
        people learn better visually
      - think like a user
        
        familiar to user
      - use models & prototypes
        
        for user approval and testing
      - focus on usability
        
        include all task, commands & communication
        (between user & info system)
      - invite feedback
        
        Help screens
      - document everything
        
        document all screen
  - - - checkboxes
      - radio buttons
      - dropdown list
      - list boxes
      - buttons
      - toggles
      - text fields
      - date field
    - - tooltips
      - icons
      - progress bar
      - notification
      - message boxes
      - modal windows
    - - accordian
    - - breadcrumb
      - slider
      - search field
      - pagination
      - slider tags
      - icons
- - - - Data Security
      - Audit Trails