This document provides an overview of shift-share analysis, which is used to decompose regional economic growth. Shift-share analysis divides growth into three components: the national growth component based on growth at the national rate, the mix component based on differences in initial industry employment mix, and the competitive component based on factors influencing growth in the local environment. The document notes that while data is generally available, accurately applying shift-share analysis can be challenging due to differences between local and national industries and difficulty identifying the specific drivers of the competitive component.