Self is a notion of common-sense psychology that several schools of psychoanalysis have built into their theories. Stern explores and expands its meaning, tracing its development back to birth and even earlier, and outlining how the psychological development of the preverbal infant contributes to its evolution. In the process, Stern discusses two perspectives on preverbal infant psychology—that of the observational empiricist developmental psychologist, and that of the reconstructing psychoanalytic clinician working from the subjective experience of adult patients, and what each might contribute to the other. His thinking suggests the importance of nonverbal models of infant (and, eventually, adult) subjective experience.