You are reviewing the testability of your SUT.

Observability in the context of a System Under Test (SUT) refers to the degree to which the internal states of the system can be inferred from knowledge of its external outputs. It is a measure of how well internal states of a system can be understood by examining its outputs. In test automation, observability is crucial because it allows testers to understand what is happening inside the SUT without having direct access to its internal workings. This characteristic is essential for identifying and diagnosing issues, understanding system behavior, and ensuring that the system is functioning correctly. High observability means that the system’s outputs, including its states and any intermediate results or error messages, are readily available for examination, which is vital for effective testing and debugging.

References = The ISTQB Test Automation Engineer syllabus and study materials emphasize the importance of observability as part of the testability of systems. It is highlighted as a key characteristic that enables testers to detect defects and understand system behavior through the outputs the system provides during test execution123.