Engineering psychology, also known as Human Factors Engineering or Human Factors Psychology, is the science of human behavior and capability, applied to the design and operation of systems and technology.[1] As an applied field of psychology and an interdisciplinary part of ergonomics, it aims to improve the relationships between people and machines by redesigning equipment, interactions, or the environment in which they take place. The work of an engineering psychologist is often described as making the relationship more "user-friendly."