As social investors, our sector is moving away from counting inputs and outputs to demanding outcomes and real impact. Globally, this trend is accelerating: communities and investors demand proof of impact, transparency, and ethical practice. Technology, from AI-driven reporting to blockchain-based verification, is making accountability sharper and harder to ignore. In the first two articles in this series on unlocking the potential of social investment to shape the future, we explored the shifts from charity to systemic change[AC1] , and from programmes to partnerships[AC2] . Now we challenge investors to ensure accountability for impact – rather than merely accounting for spend.