Despite difficult challenges during responses to the terrorist attacks of September 11, 2001, Hurricane Katrina, and the 2009 Pandemic Influenza A/H1N1 and severe acute respiratory syndrome outbreaks, no North American emergency to date has overwhelmed intensive care unit (ICU) services on a widespread basis since the modern development of the field of critical care. However, planners have recognized that in a future public health emergency we may not be so fortunate. To deal with very large emergencies involving many patients whose survival depends on immediate access to intensive care, an international Task Force for Mass Critical Care proposed recommendations in January 2007 to extend critical care resources for the adult population, referred to as the Emergency Mass Critical Care (EMCC) approach (1–5). The EMCC approach triples critical care capabilities for a period of up to 10 days in a very large public health emergency by focusing on immediately lifesaving interventions, while delaying or forgoing less urgent care. Crisis standards of care in a large public health emergency would attempt to optimize population outcomes, rather than use unlimited efforts to maximize survival of each individual. Available resources would be substituted or adapted for equivalent or nearly equivalent unavailable resources. Resources would be conserved, reused, and reallocated to those patients most likely to benefit from them. Modest increases in stockpiles and major changes in the organization of care would be essential. While planners in the field acknowledge that mass critical care is a reasonable concept, we lack evidence that such an approach is feasible. However, failure to begin operational planning for mass critical care guarantees a failed response. As public health emergency planners begin to consider the EMCC framework, it is urgent that pediatric implications be detailed for integration into these developing plans. This supplement represents the discussions of a multidisciplinary panel convened by the Oak Ridge Institute for Science and Education (supported financially by the Centers for Disease Control and Prevention), and provides guidance for pediatric EMCC (PEMCC). Work of the PEMCC Task Force was directed by a 17-member Steering Committee selected on the basis of their expertise and experience, and included representatives from the Task Force for Mass Critical Care, World Federation of Pediatric Intensive and Critical Care Societies, American Academy of Pediatrics, American College of Critical Care Medicine, American College of Emergency Medicine, Royal College of Physicians (Canada), and National Commission on Children and Disasters, as well as several unaffiliated disaster preparedness experts. This Steering Committee led development of all manuscripts and selected individuals for the PEMCC Task Force. The full PEMCC Task Force comprised 44 experts from fields including bioethics, pediatric critical care, pediatric trauma and surgery, neonatology, obstetrics, general pediatrics, emergency medicine, pediatric emergency medicine, disaster preparedness and response, emergency medical services (EMS), infectious diseases, toxicology, military medicine, nursing (including critical care nursing), pharmacy, veterinary medicine, information sciences, public health law, maternal and child public health, and local, state, and federal government emergency planning and response agencies. Priority topics were organized on the basis of MEDLINE and Ovid database literature searches, bibliographies, state and federal government planning documents, after-action reports of recent medical responses to catastrophes, and through participation in local, state, and federal government working groups on hospital and disaster preparedness. Where evidence was available, it was utilized in formulating recommendations. Where evidence was lacking, recommendations represent expert opinion. Wherever possible, recommendations are consistent with and easily integrated into prior recommendations of the adult Task Force for Mass Critical Care. The Steering Committee produced draft outlines by synthesizing information obtained in the evidence-gathering process and convened October 6–7, 2009, to review and Vice President, Medical Affairs, British Columbia Children’s Hospital and Sunny Hill Health Centre; BCCH and UBC Global Child Health, Department of Paediatrics and Emergency Medicine, University of British Columbia, Child and Family Research Institute, Vancouver, British Columbia, Canada. The Pediatric Emergency Mass Critical Care Task Force meeting was supported, in part, by the Centers for Disease Control and Prevention. Disclaimer: The views expressed in this article are those of the authors and do not represent the official position of the Centers for Disease Control and Prevention. The author has not disclosed any potential conflicts of interest. For information regarding this article, E-mail: nkissoon@cw.bc.ca Copyright © 2011 by the Society of Critical Care Medicine and the World Federation of Pediatric Intensive and Critical Care Societies