A Strategic Proposal for Encouraging Tumbler Use to Reduce Plastic Cup Consumption : focusing on Institutional, Behavioral, Technological, and Perceptual Dimensions

To address the growing environmental issues caused by the increasing use of single-use plastic cups, this study proposes strategies to promote the use of tumblers. Using the Double Diamond design process, user observations and interviews were conducted to identify four key barriers: behavior, policy, technology, and perception. Based on these findings, a multifaceted solution was designed, including a digital reward system, usage reminders, automatic cleaning infrastructure, and an emotion-based awareness campaign. The proposed strategies aim to establish habitual tumbler use, with each element complementing the others to foster sustainable practices. Furthermore, by integrating public design, behavioral economics, and UX design, the study presents an innovative approach to encouraging tumbler adoption. To enhance the effectiveness of these strategies, the study highlights the importance of localized policies and a collaborative framework between the public and private sectors. This study holds significance in proposing actionable design strategies that contribute to fostering an eco-friendly consumption culture.