A software product is being developed for validating retail sales transactions that include cash, checks,...

Testing from the cashier’s perspective focuses on how effectively and easily an end user can perform real work tasks with the software. In this case, the cashier must validate different retail payment transactions, including cash, checks, and cards. Usability testing evaluates whether the user interface, workflow, prompts, error messages, and task sequence support users in completing their work accurately and efficiently. Unit testing checks individual code modules and is not performed from a cashier’s viewpoint. Alpha testing is early internal testing before broader release, but it does not specifically address the cashier’s interaction experience. Performance testing evaluates speed and behavior under load. Since the question emphasizes the user perspective, usability testing is correct.

================