Certified Reliability Engineer 2025 – 400 Free Practice Questions to Pass the Exam

Non-functional reliability requirements focus on the system's performance characteristics that do not relate directly to specific functional behaviors. These requirements are crucial because they define how a system performs under operational conditions rather than what it does.

The correct answer highlights that non-functional reliability requirements specifically address the reliability and availability metrics, which are essential for understanding how dependable the system will be during its lifecycle. This includes aspects such as how often the system is expected to fail, the mean time between failures (MTBF), and the system's uptime. Establishing these metrics helps in assessing whether the system will meet its operational needs and serve its intended purpose reliably over time.

Other options mention cost, interface design, and environmental impact, which are all important factors in a system's overall design and impact but do not fall under the category of non-functional reliability requirements. Instead, they pertain to financial, usability, and ecological considerations that are separate from the core metrics that indicate reliability and availability.