The Impactomatrix was developed within Cluster 1 of DARIAH-DE and is documented in the following DARIAH Working Paper (in German): Timo Gnadt, Viola E. Schmitt, Juliane Stiller, Klaus Thoden. "Faktoren und Kriterien für den Impact von DH-Tools und Infrastrukturen". DARIAH-DE Working Papers Nr. 21. Göttingen: DARIAH-DE, 2017. Online: Download PDF

You can access the repository on Github.