This article examines how the notion of â€˜shared responsibilityâ€™ is enacted in Cambodiaâ€™s waste management planning report, Phnom Penh Waste Management Strategy and Action Plan 2018â€“2035. Reframing the concept of â€˜responsibilityâ€™ as â€˜response-abilityâ€™, I aim to foreground the relational aspects of responsibility, particularly human and more-than-human relations, to which the anthropology of planning has paid relatively little attention. I demonstrate how the report envisions various stakeholdersâ€™ abilities to respond to the current waste management challenges by examining three modes of mediation: legality, visibility and infrastructural microbiopolitics. Methodologically, I demonstrate that the bureaucratic report can serve as a helpful tool for waste scholars to uncover how different realities of waste are enacted and made manageable â€˜on paperâ€™. I argue that planning not only produces an â€˜elusive promiseâ€™ but also engenders â€˜elusive responsesâ€™: waste planning always involves managing complex relations in addition to mere waste materials.