Which scenario is an example of a Partial Failure?

Which scenario is an example of a Partial Failure?

• A. BMS is working but the motion detector is inoperative or vice versa.
• B. The motion detector is functioning normally and no BMS issues.
• C. The entire system is offline due to power outage.
• D. An intrusion is detected but not reported.

Answer: (A)

Partial failure means only part of the system stops working while the rest still operates. In this scenario, the building management system continues to function, but the motion detector is inoperative (or vice versa). That creates a mixed state where some capabilities are intact while others are down, which is the essence of a partial failure. The other situations don’t show that same mixed state. If everything is functioning normally, there’s no failure. If the entire system goes offline due to a power outage, that’s a total/system-wide failure, not partial. If an intrusion is detected but not reported, the failure lies in the alerting/communication path rather than a single component failing while others remain healthy.

Partial failure means only part of the system stops working while the rest still operates. In this scenario, the building management system continues to function, but the motion detector is inoperative (or vice versa). That creates a mixed state where some capabilities are intact while others are down, which is the essence of a partial failure.

The other situations don’t show that same mixed state. If everything is functioning normally, there’s no failure. If the entire system goes offline due to a power outage, that’s a total/system-wide failure, not partial. If an intrusion is detected but not reported, the failure lies in the alerting/communication path rather than a single component failing while others remain healthy.