Materials with tunable optical properties because of external means such as illumination, temperature, pressure, electric and magnetic fields, X-rays, ion-beam radiation, gases, or electrochemical potential have large potential. Some of the main drivers of the research activity in this field are the reduction of energy consumption by smart controlling of light and heat transfer through windows, the demand of opto-electronic and medical industry for emitting and sensing devices, as well environmental technology to increase functionality of chromogenic devices. Current experimental and theoretical studies aim to increase the impact that chromogenic materials and devices can play in technological advances. In recent years, new organic, inorganic, and hybrid chromogenic materials have been developed in the form of bulk, nano, and composite materials. In applications, devices may be controlled directly by the user, or via automated systems. Challenges abound related to extending the processability and durability of chromogenic materials and devices. This symposium will cover the complete range of the chromogenic materials and devices from fundamental aspects, materials development, characterizations, and toward applications. Specific attention will be given to new materials and devices, new applications of chromogenic materials, theoretical and experimental methods on materials synthesis and characterization, device design including interface issues, extending durability, stability, and life-cycle analysis.