Recent changes in medical education have resulted in an increased focus on patient safety. It is vital that new doctors can recognize and manage acutely-ill patients, as well as work safely and effectively as a member of a multi-professional team. A ward simulation exercise has been developed to provide a safe, but authentic setting to support junior doctors with further practice and feedback. In developing such an exercise realism is important in recreating the complex climate in which the junior doctor has to function as part of the healthcare team in the hospital ward. This paper shares the design methodology of a ward simulation exercise and the views on its authenticity from both the junior doctors and the observers.