This article elaborates and extends the Vargo and Lusch (2004a) service-dominant (S-D) logic thesis. Three linked exchange-enablers and their potential for improving value-in-use are discussed: first, relationships to give structural support for the creation and application of knowledge resources (relating); second, communicative interaction to develop these relationships (communicating); and third, the knowledge needed to improve the customer's service experience (knowing). These activities are integrated within an augmented S-D exchange model, and the implications for co-creating value are discussed. Finally, the argument is put that a customer's value-in-use begins with the enactment of value propositions, and the development of reciprocal value propositions is discussed in the context of the notion of sustainable betterment.