Ergonomics is defined as “the scientific discipline concerned with the understanding of interactions among human and other element of a system.” The principle of ergonomics is to design a system as human-centered manner, and the most important concepts of ergonomics are; 1) the system concept, 2) load-effect concept, 3) usability and 4) accessibility. These concepts are applied to almost all field of system design which involves one or more human beings. In this paper, some case studies are shown to which the concepts of ergonomics are applied in various field and ergonomics has almost similar goal and discipline with Transdisciplinary Science and Technology.