How does human-factors engineering relate to systems engineering?

Human-factors engineering is deeply integrated into systems engineering as a critical discipline focused on the successful integration of human operators into complex machine systems. While systems engineering prioritizes overall performance and user-oriented objectives—such as reliability, ease of maintenance, and operational convenience—human-factors engineering provides the scientific data and principles necessary to ensure these systems are safe, productive, and compatible with human physical and psychological characteristics.123

In the context of large-scale systems, such as jet airliners or space vehicles, the relationship between these fields is essential for several reasons:

• Personnel and Training: Systems design requires the specification of personnel requirements and the development of training programs to ensure operators possess the necessary skills to function effectively within the system.2
• Operational Procedures: Human-factors engineers help define instructions and rules that dictate how a system functions, ensuring that duties are tailored to both the system's requirements and the human operator's capabilities.2
• Scientific Integration: Rather than relying on intuition, human-factors engineering applies rigorous scientific methods to identify and resolve human-machine mismatches, which is vital for achieving the high-level performance goals set by systems engineers.4

Ultimately, both disciplines share a commitment to evaluating how well a system performs in the hands of the user.3