Rapid changeover is one of the most important tools to master for emergency medicine and healthcare. The concept of changeover affects every aspect of the emergency department (ED). Examples of changeover include, but are not limited to, room changeover from one patient’s departure to the arrival of the next; the time a procedure is noted to be necessary until it is completed; the time the CT scanner stops on one patient to the time the CT scanner starts on the next patient. These are all situations where understanding the concept of rapid changeover and how to approach changeover will literally transform your workplace.