My research interests include indoor air quality, post-occupancy evaluation, and spatial design for seniors. At the beginning of my research journey, I explored these theories and applications individually, viewing them as separate research areas. However, with accumulated research experience and prior practical experience in the design industry before my PhD studies, I began to recognize the interconnections among these topics and started pursuing interdisciplinary research. From 2023 to 2024, I applied knowledge and methods from these three areas to a practical interior design project, completing a smart, health-oriented, senior-friendly studio apartment in Douliu. This project integrated indoor air quality measurements and analysis both pre- and post-construction, post-occupancy evaluation, and age-friendly design, marking an initial step toward the goal of “From Knowledge to Action.”