This document proposes a framework for value metrics from a Service-Dominant Logic perspective. It defines potential value as the value proposition offered by service providers, and realized value as the actual benefits gained through resource integration. Interactions, context, time, and institutions are proposed as mediators that influence the conversion of potential to realized value. The framework is conceptual and intended to guide future research on developing concrete scales to quantitatively measure value in service systems. Validating the framework will require empirical studies involving service providers and customers from different industries.