Which key activity is emphasized in the testing phase of RSI Phase 5?

In the testing phase of RSI Phase 5, conducting thorough integration testing is emphasized because this type of testing ensures that various components of the system interact correctly. Integration testing focuses on the interfaces and the flow of data between modules, validating that integrated components work together as expected. It helps identify issues in the interactions between different parts of the application that unit testing alone may not catch, ensuring that the complete system operates as intended when all components are integrated.

While unit testing is crucial, it primarily focuses on individual components rather than their interactions. Developing user manuals is important for end-user support but does not directly relate to verifying system functionality during the testing phase. Documenting business requirements is essential for the project scope but is a different phase of the development cycle altogether and does not pertain directly to the testing activities. Therefore, thorough integration testing stands out as the critical focus in the testing phase, ensuring that the system operates seamlessly as a whole.