7.3 The systems life cycle: Testing and implementation

The users interface

Input devices:

  • The scanner at the checkout
  • hand-held scanners for counting and recording stock – these might also be used to record special offers or price reductions
  • the EPOS/EFTPOS terminal
  • a Chip and PIN reader.

Output devices:

  • a display screen for the checkout operator
  • a display screen for the customer
  • a printer for itemized receipts
  •  a portable bar-code printer attached to the hand-held scanner

The analyst must also check that:

  • any messages and user in structions are clear
  • all displays are easy t read
  • the display is accessible to all customers – it may needed to be adjustable.

Testing data entry

The purpose of test data is to make sure that:

  • inputs to the system are valid
  • outputs from the system are accurate
  • outputs are presented clearly.