Functional performance tests need to show correct operation under which operation modes?

Functional performance tests need to show correct operation under which operation modes?

• A. Some
• B. All
• C. A few
• D. None

Answer: (B)

Functional performance tests aim to prove that the system operates correctly in every mode it could encounter. A mode can be startup, normal operation under different conditions, various energy-saving or standby states, manual overrides, fault or degraded operation, and shutdown. Verifying all of these ensures that control logic, interlocks, alarms, sequencing, and user interfaces behave as intended in each situation and that transitions between modes are safe and reliable. If you only test some modes, you risk missing mode-specific defects that could surface during real operation, compromising safety, performance, or user expectations. That’s why testing for all defined operation modes is the best approach.

Functional performance tests aim to prove that the system operates correctly in every mode it could encounter. A mode can be startup, normal operation under different conditions, various energy-saving or standby states, manual overrides, fault or degraded operation, and shutdown. Verifying all of these ensures that control logic, interlocks, alarms, sequencing, and user interfaces behave as intended in each situation and that transitions between modes are safe and reliable. If you only test some modes, you risk missing mode-specific defects that could surface during real operation, compromising safety, performance, or user expectations. That’s why testing for all defined operation modes is the best approach.