Final answer:
Incidents in software development are raised for defects or issues. They can be raised against requirements, documentation, or test cases. However, incidents are not raised against improvements suggested by users as they are enhancements for future consideration.
Step-by-step explanation:
Incidents in the context of software development and testing are usually raised when there are defects or issues in the system that deviate from the expected behavior defined by the requirements or the design. When considering the options given:
- Requirements: Incidents can definitely be raised against requirements if they are not being met by the solution or if the solution behaves in a way that is contrary to those requirements.
- Documentation: If the documentation does not match the actual behavior of the system, this can also be a cause for raising incidents.
- Test cases: If test cases fail because the system behavior does not match the expected outcome, incidents can be raised.
- Improvements suggested by users: Typically, improvements or enhancements suggested by users are not the basis for incidents. Instead, they might be captured as part of new requirements or features to be considered for future releases. An incident implies something is broken or not working as intended, while an improvement is a recommendation for enhancement.
Therefore, the correct answer is D. Improvements suggested by users. An incident would not be raised against improvements because they do not represent a fault or issue that needs immediate attention; they are suggestions for making the system better in the future.