In what follows, I would like to discuss a few of the issues that Stern has cast light on in The Interpersonal World of the Infant, rather than review his book or cover the entire volume systematically. I will compare Stern's concept of development and that of psychoanalysts, and try to account for the relative insignificance of the drives in Stern's observations. I will warn the reader against the genetic fallacy in which one fails to recognize the transformations that occur as the child grows older and instead views the behavior, feelings, and thinking of the older child as if they were the same as those of the infant or small child. I will compare certain of Stern's findings to those of Mahler's (Mahler, Pine, and Bergman, 1975).