The authors propose that people adopt others ’ perspectives by serially adjusting from their own. As predicted, estimates of others ’ perceptions were consistent with one’s own but differed in a manner consistent with serial adjustment (Study 1). Participants were slower to indicate that another’s perception would be different from—rather than similar to—their own (Study 2). Egocentric biases increased under time pressure (Study 2) and decreased with accuracy incentives (Study 3). Egocentric biases also increased when participants were more inclined to accept plausible values encountered early in the adjustment process than when inclined to reject them (Study 4). Finally, adjustments tend to be insufficient, in part, because people stop adjusting once a plausible estimate is reached (Study 5). We have endeavored to show... that thought in the child is egocentric, i.e., that the child thinks for himself without troubling to make himself understood nor to place himself at the other person’s point of view.... If this be the case, we must expect childish reasoning to differ very considerably from ours, to be deductive and above all less rigorous. (Piaget, 1959, p. 1) Children view their perceptions of the world as accurate reflections