Questions about what experts need to know to facilitate their collaboration in interdisciplinary situations are usually answered with proposals concerning the technical methods, epistemic ground rules, and explanatory theories that one applies “across” disciplines, just as such methods, rules, and theories are applied “within” a discipline. However, phenomenology offers something better. Instead of following the traditional route of looking for general conditions that apply to collaborative practice, phenomenology turns to what actually happens in collaborative experience and shows that success is (...) not just a function of applied procedures, even when they are in play. Instead, individual experts seem to rediscover their ability to keep their thoughts and concepts looser, more informal, and open-endedly responsive to the situation—just as they did when they first began to shape unfamiliar circumstances into a regionally shared practice—only now with potentially interdisciplinary circumstances as their experienced phenomenon. By cultivating an awareness of how it is with life prior to its being variously studied, exploited, or harnessed to explanatory theories and essentialist ideas, they remain open to becoming expert collaborators, just as they are already regional experts. An example of this process is given from the authors’ recent field research. (shrink)