This document provides an introduction and background for the Nursing-Sensitive Care Performance Measure Set. It describes how the measure set was initially identified and endorsed by the National Quality Forum in 2004. Fifteen measures were identified through a consensus process. The document discusses the need for standardized technical specifications to allow for national implementation of the measures. It provides a brief overview of the types of structures, processes and outcomes assessed in the measure set. The overall goal is to quantify the impact of nursing care on quality.