To address the product risk of requiring an availability of almost 100%, the quality characteristic of reliability should be part of the test approach. Reliability testing focuses on the ability of the system to perform under expected conditions for a specified period of time. It is essential for systems that need to be operational continuously or near-continuously. This characteristic encompasses the system's uptime, fault tolerance, recoverability, and the ability to perform under anticipated conditions, all of which are relevant to maintaining high availability.