The possible is, by definition, a transdisciplinary topic. The study of the possible bridges the gap between the natural and the social sciences while keeping a strong grounding in the arts and humanities. In this entry, I consider four key questions within Possibility Studies and argue for the need to answer them using a transdisciplinary approach: What kinds of psychological, social, material, technological and cultural resources and processes enable our engagement with the possible? How do individual differences, environmental contexts and situational factors ‘collaborate' in shaping experiences of the possible? What is the relation between individual, group, community and societal forms of becoming aware of and exploring possibilities? How do power relations structure our imagination of the possible and with what consequences for how self and society are constituted? The entry ends with reflections on how to decide which possibilities to enact and which to reject, which possibilities are valuable and which are harmful, the core of the ‘ethics of possibility’.