The incident command system (ICS) is a framework for organizing and directing on-site, tactical responses to a particular event or series of events. ICS provides a command structure for coordination, information flow, analysis, decision-making, communications, and implementation in an authoritative and standardized manner. The ICS framework has been used for emergency response in a variety of situations where the environment, human health, or other resources are at risk, including wildfires, natural disasters, terrorist attacks, oil and chemical spills, infectious disease outbreaks, and invasive species. This paper outlines the key components of ICS, as well as major elements for building ICS capacity. It concludes with a list of considerations for applying ICS in the invasive species context. Keywords Early detection and rapid response (EDRR) Á Emergency response Á Incident command system (ICS) Á Invasive species Á Rapid response