The field of impact investing has developed over more than five decades, gaining traction as a lever for driving social change and equity, and as a prudent investment strategy. Many types of organizations have taken up the approach, including foundations, faith-based organizations, health systems, pension funds, insurance companies, corporations, wealth managers, banks fulfilling the Community Reinvestment Act, and individuals seeking social and environmental benefits alongside financial returns. Government is also a frequent partner. Still, impact investing is relatively new to many philanthropic funders, which has led trustees, staff, and fiduciaries generally to ask how they could or should apply impact investing and broader social investing techniques to advance their missions and values.