In 2009 the Institute of Medicine (IOM) began to assess the need for better-defined medical and public health crisis standards of care (CSC) for catastrophic disasters and public health emergencies. Over the next 10 years, the IOM defined templates for those stakeholders responsible for integrated CSC planning and implementation; created a tool kit with guidance on indicators and triggers; provided a discussion kit for stakeholders to use with their own communities to establish appropriate indicators and triggers to guide their planning; disseminated the messages and key concepts of CSC; and built on the initial efforts to refine certain elements and address remaining gaps. This current Proceedings of a Workshop captures the discussions from a 2019 workshop reviewing the successes and gaps over the last 10 years of CSC work, in order to inform the next phases of planning and implementation.