The implications for clinical practice is a recurring idea in the book. After explaining the four senses of the self and their associated relatedness domains, Stern begins Part III of the book which discusses the implications of Self Psychology for clinical practice. Chapter 9 discusses how the observed infant is understood from the perspective of the clinical. In short, this chapter shows how the experimental evidence from the observed infant can be organized and interpreted through the lens of clinical theories of infant psychology and subjective experience. Stern discusses how experimental observations of overstimulation can be made sense of in terms of Stern's affect attunement, to give one example.