As part of a comprehensive action-research initiative on mainstreaming scaling in funder organizations, the Scaling Community of Practice developed a framework for assessing the nature and extent of integration of transformational scaling practices in funder organizations operational approach. The framework was distilled in a “Mainstreaming Tracker Tool” (MTT), which allows funder organizations to plan, track and adapt their mainstreaming efforts. The framework consisted of 13 elements, of which 6 are elements that enable the mainstreaming process, and 7 are elements that relate to the operationalization of mainstreaming scaling.