This document discusses establishing the ThriveAbility Foundation and Index to promote regenerative and thriving development. It notes current gaps in sustainability, culture, and organizations' ability to meet sustainability goals. The ThriveAbility Index would track progress across these three dimensions and be a public good overseen by the Foundation. It would help organizations and societies progress from less bad to sustainable to thriving stages of development. The Foundation seeks funding from foundations, corporations, and others to support its programs and educational outreach.