Determining feedback methods and error handling relates to which category of system design specification?

Determining feedback methods and error handling is fundamentally tied to user interface design because it directly impacts how users interact with a system. The user interface encompasses everything that users engage with, including the methods of feedback provided during their use of the system. Effective feedback methods notify users of the system's responses to their actions, guiding them through processes and informing them of errors.

Error handling is also a crucial aspect of user interface design since it addresses how a system communicates problems or unexpected outcomes to the user. A well-designed user interface will provide clear, understandable messages that help users recover from errors or make corrections, playing an essential role in improving user experience and system usability.

Training and documentation, manual procedures, and security and controls, while important in their own rights, do not focus as specifically on the interactive elements that encompass feedback mechanisms and error handling related to direct user interactions with the system.