Ergonomics is the scientific discipline concerned with the understanding of interactions among humans and other elements of a system, and the profession that applies theory, principles, data and methods to design to optimize human well-being and overall system performance.Proper ergonomic design is necessary to prevent repetitive strain injuries and other musculoskeletal disorders, which can develop over time and can lead to long-term disability.Human factors and ergonomics is concerned with the "fit" between the user, equipment, and environment or "fitting a job to a person".It accounts for the user's capabilities and limitations in seeking to ensure that tasks, functions, information, and the environment suit that user.