Our paper entitled, “Design Opportunities in Three Stages of Relationship Development between Users and Self-Tracking Devices,” was presented by Dajung Kim (co-authors: Yeoreum Lee, Saeyoung Rho, and Youn-kyung Lim) at CHI 2016, San Jose, CA, USA. In this paper, we proposed a new lens to understand and design for changing interaction between users and self-tracking devices.