Usability in health information technology primarily concerns:

• A. The efficiency and effectiveness of an application
• B. The physical layout of the data center
• C. The training level of end users
• D. The security of patient data

Answer: (C)

Usability in health information technology is about how easily and effectively a user can interact with the system to complete tasks, ideally with little effort and error and with satisfaction. The option that describes efficiency and effectiveness of the application best captures this idea, because it focuses on how well the system supports task performance in real use.

Training level of end users matters for competency, but it is not what usability measures. Usability concerns the design and behavior of the software itself—how intuitive the interface is, how smoothly workflows support clinicians, and how quickly tasks can be completed without confusion. The physical layout of the data center is about hardware infrastructure, not user interaction with the software. Security of patient data is about protecting information, not how user-friendly the application is.