This metric is multi-dimensional with regard to the five dimensions of impact. In specific contexts, and based on evidence, this metric may serve as a proxy indicator of whether the outcome being sought by an investor or organization is occurring (the WHAT dimension of impact). This metric may also identify a specific the WHO dimension subdimension of impact, which details which stakeholders the investment or enterprise aims to reach with the outcome. This metric may also help clarify how underserved they were prior to the investment. For more on the alignment of IRIS metrics to the five dimensions of impact, see IRIS+ and the Five Dimensions of Impact (https://iris.thegiin.org/document/iris-and-the-five-dimensions/). No single metric is sufficient to understand an impact; rather, metrics are selected as a set across all dimensions of impact. When possible, the selection of metrics to measure and describe the five dimensions should be based on best practice and evidence.