The KM Impact Challenge is an initiative to demonstrate the impact of knowledge management investments. It partnered with organizations to compile 47 case stories of KM initiatives from around the world. These case stories were peer-reviewed according to criteria like clarity and replicability. Most case stories used qualitative approaches like feedback and reflection to assess impact in addition to some quantitative measures. A variety of tools were mentioned to evaluate the initiatives, including established methods like outcome mapping and most significant change.