What should be done to ensure that testing covers all aspects of user requirements?

To ensure that testing covers all aspects of user requirements, following a requirements traceability matrix is essential. A requirements traceability matrix serves as a structured document that maps requirements throughout the validation process. This helps in tracking each requirement and ensuring that it has corresponding test cases, facilitating comprehensive coverage of all specified user requirements.

By utilizing the traceability matrix, testers can verify that all requirements are addressed by the test cases, which minimizes the risk of overlooking any critical functionality that may impact the user experience. Additionally, it allows for easier identification of missing or untested requirements, thus promoting a thorough and systematic testing approach that aligns closely with user needs.

In contrast, testing only critical functionalities may lead to important aspects being neglected, while conducting testing in isolation could prevent the context of user requirements from being fully understood. Ignoring less significant requirements could also result in missing essential details that contribute to the overall functionality and user satisfaction. Hence, the use of a requirements traceability matrix is the most comprehensive strategy to ensure that all user requirements are adequately covered during the testing process.