Which of the following is cited as a criterion of efficiency?

• A. Cost per unit of service
• B. Speed
• C. Reliability
• D. User satisfaction

Answer: (D)

Focusing on how efficiently a library service turns resources into valued outcomes helps you understand why user satisfaction is the best criterion among these options. Efficiency isn’t just about spending less or moving faster; it’s about delivering services that meet users’ needs effectively with reasonable use of time, money, and effort. When users are satisfied, it signals that the service is providing useful, reliable results relative to the resources invested.

Cost per unit of service highlights spending efficiency, but it doesn’t by itself speak to whether the outcome is valuable to the user. Speed is about pace, which matters, but fast service isn’t sufficient if it isn’t accurate or helpful. Reliability ensures consistent performance, a quality factor that supports satisfaction but doesn’t alone measure overall efficiency.