This document discusses three "holy grails" of improving social impact: 1) defining outcomes, 2) measuring and transparently reporting outcomes to change resourcing decisions, and 3) collaborative and participative approaches. It argues that without clear outcomes, effective measurement, and collaboration across sectors, the social impact system will not be able to meet future challenges. Measurement is valuable for focusing organizations on outcomes and allowing funders to reallocate resources, but barriers include costs, timeframes, and lack of agreement on methods. The document advocates for defining shared outcomes, shared measurement, open data, long-term collaborative approaches, and a learning system oriented toward community outcomes rather than individual programs.