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Data Design (DB Mgmt Sys. (Physical files (on disk) (How to organise data,…

- - - - serial (stored in
        order it was created)
      - sequential (stored
        in some defined sequence)
    - - serial for storage,
        sequential as index to serial
- - - - Verification (error-free)
        
        Self-checking codes
        
        Repeat back what
        the user entered
        
        Double-keying (repeat
        password entry)
      - Validation (as expected)
        
        Existence Checks
        
        Range Checks
        
        Cross-field validation
    - - Data Type
      - Length
      - Format
      - Value Range
      - Mandaatory
      - Default Value
      - Visibility
    - - physical
      - logical
    - - Control totals
      - Spot Checks
      - Pre-numbering
    - - Serial no.of batch
      - Count of batch contents
      - S/N of forms in batch
      - Batch control totals
      - hash controls