Which of the following non-functional quality attributes is not highly…

Answer: Usability — Usability is the non-functional attribute least directly affected by software architecture.

• Performance: Architecture strongly influences throughput and latency through choices about distribution, concurrency, caching, data partitioning, and communication patterns.

• Reliability: Architecture provides the mechanisms for fault isolation, redundancy, replication, failover, and monitoring that determine system reliability.

• Portability: Architectural decisions such as modularization, abstraction layers, and dependency management determine how easily software can be moved between platforms.

• Usability: Primarily driven by user interface and interaction design, user research, and front-end implementation. Architecture can impose constraints (for example, on responsiveness) but does not directly determine the quality of user interactions.

• Practical guidance: When deciding which non-functional attributes are architecture-sensitive, ask whether achieving the attribute requires system-level organization (architecture) or primarily front-end design and implementation.