What term describes the capability of the software product to be tested after modifications?

The term that best describes the capability of a software product to be tested after modifications is testability. Testability refers to the ease with which a system can be tested to ensure it meets its requirements and functions as expected after changes have been made. High testability implies that the software has been designed in a way that allows for efficient testing processes to be carried out, facilitating quick verification of the software's performance and behavior following updates.

For example, if a software product is modular and well-documented, it can be more easily tested after changes due to its clear structure and the presence of automated tests that can quickly check for regressions or failures. This quality is essential in agile environments, where frequent modifications are common, and ensuring that new features do not introduce defects is crucial.

In contrast, usability focuses on how user-friendly and accessible a software application is, which relates to the user's experience rather than how easily the product can be tested. Understandability pertains to how easily stakeholders can comprehend the system's functionality or requirements, a different aspect than testability. Traceability entails the ability to link requirements back to their respective tests, which is important for tracking and managing testing efforts but does not directly address the testing capabilities post-modifications.