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.