GSCM's Sustainable Impact Score (SIS) provides investors with a sophisticated set of metrics comparable to an earnings per share (EPS). The SIS allows for the transparent measurement of impact in a way that is consistent over time and investments. It provides a measure of performance for investee firms and investors, and facilitates monitoring and reporting. SIS also allows for reporting under the Sustainable Development Goals (SDG's).

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An in depth assessment and application of GSCM’s sustainability assessment model generates the SIS. Each project is assigned a target score and progress towards this is measured on a regular basis. An action plan is developed to deliver the target SIS. A high priority is placed on delivering environmental, social and ethical value whilst adding to the value of a project, for example through integrating small holder farmers into a project’s business model.