Promoting well-being is a philosophy of the World Health Organization （WHO）. Although the International Ergonomics & Human Factors Association and Japan Human Factors and Ergonomics Society state that the goal of ergonomics is to optimise human well-being and the overall system performance, the methodology of well-being is still developing. In this study, the importance of play is described as a research topic and the degree of play is explained as a basic indicator. The definition of play here is the activation of one’s reward system through intrinsically-motivated decisions and actions, not for the direct purpose of survival. The playability index is a subjective evaluation method consisting of 12 items. Ergonomic researchers must develop indicators that contribute to the promotion of well-being.

The revised core competencies of the International Ergonomics Association, along with the Sustainable Ergonomics Goals proposed by the Japan Human Factors and Ergonomics Society, emphasize the recognition of stakeholder collaboration as a new academic research agenda. In this research issue, the “Seven Human Factors and Ergonomics Tips for Practicing Bundling Science” are introduced as elements for conducting team building that takes stakeholders’ well-being into account, and are proposed as a research agenda. We are expected to play the role of architects who nudge people toward choices that improve their lives, as well as entrepreneurs who can design stakeholder interactions.

Two measurements–body pressure distribution and pelvic tilt angle–are often used in research on posture and movement while sitting. Prior to the study, the authors conducted a training session to learn how to measure body pressure distribution and pelvic tilt angle using commercially available measurement devices for sofas manufactured by multiple furniture companies based on their in-house designs. As a result, the idea that wearable measurements are more appropriate than commercially available measurement devices for the measurement of sofas that allow a free-seating posture was obtained. Therefore, we developed a wearable measurement device to simultaneously measure the body pressure distribution in the sagittal plane of the femur and lumbar spine （referred to as the pressure profile） and the pelvic tilt angle. The results suggest that wearable devices are more appropriate than commercially available devices for measuring furniture and welfare equipment that allow free posture during measurement.