The document discusses the history and future of performance metrics and evaluation in large foundations. It outlines how evaluation has become ubiquitous in foundations since the 1960s-1970s, driven by laws, associations, and publications. It also describes different methodologies used for evaluation and examples of social metrics and performance metrics developed by some foundations to measure outcomes. Going forward, it suggests performance and social metrics are unlikely to dominate due to foundations' external focus on building field capacity rather than internal decision-making, and that foundations will continue seeking legitimacy through diverse evaluation approaches.