Humans constantly have to coordinate their decisions with others even when their interests are conflicting (e.g., when 2 drivers have to decide who yields at an intersection). So far, however, little is known about the development of these abilities. Here, we present dyads of 5-year-olds (N ϭ 40) with a repeated chicken game using a novel methodology: Two children each steered an automated toy train carrying a reward. The trains simultaneously moved toward each other so that in order to avoid a crash-which left both children empty-handed-1 train had to swerve. By swerving, however, the trains lost a portion of the rewards so that it was in each child's interest to go straight. Children coordinated their decisions successfully over multiple rounds, and they mostly did so by taking turns at swerving. In dyads in which turn-taking was rare, dominant children obtained significantly higher payoffs than their partners. Moreover, the coordination process was more efficient in turn-taking dyads as indicated by a significant reduction in conflicts and verbal protest. These findings indicate that already by the late preschool years children can independently coordinate decisions with peers in recurrent conflicts of interest.Keywords: coordination, cooperation, conflict, compromise, turn-taking, dominanceHumans are highly successful at coordinating their decisions with others when pursuing shared interests (Bicchieri, 2006;Tomasello, 2014). However, a central challenge of human social functioning is that people often have to coordinate even in social dilemmas in which their interests are conflicting, for example, when one of two drivers has to yield at an intersection or when deciding who has to do an undesirable part of a joint work project. What these situations have in common is that each individual prefers someone else to incur the cost of behaving cooperatively but everyone is worse off if no one volunteers to cooperate (commonly modeled as "volunteer's dilemmas" or "chicken games" in game theory; see Archetti, 2009;Rapoport & Chammah, 1966). In large modern societies these situations are often resolved through collectively agreed upon coordination rules grounded in our culturally shared normative understanding (e.g., standing in line at supermarket checkouts) and sometimes formulated in formal laws (e.g., traffic rules).In repeated dyadic interactions, however, such explicit rules often do not exist and people are frequently required to generate solutions independently, for example, when two spouses have to decide who picks up the kids from school. One solution to dyadic conflict-of-interest coordination problems is to take turns at behaving cooperatively as this ensures that the interaction is mutually profitable in the long run. Indeed, turn-taking is commonly used in natural settings, as shown, for example, by ethnographic analyses of fishermen taking turns at fishing in preferred spots (Berkes, 1986), or anecdotal evidence of soldiers taking turns at assuming the most exposed position in a combat military formati...