The similarities between anaesthesia and aviation are quite obvious. Although flight simulators have been important for many decades simulation of anaesthesia has only attracted interest in the last few years. Anaesthesia Simulator is a low budget alternative for theoretical anaesthesia training. It is currently used as a teaching aid in several of Sweden s University Teaching Hospitals. Although primarily aimed at anaesthetic trainees it may also be of interest to surgeons in training, nurses working in anaesthesia and intensive care environments, ambulance paramedics and medical students. It can be used by the individual student and can also form the basis for a tutorial. It emphasizes the basic physiological and pharmacological principles that underpin the clinical practice of anaesthesia. Version 4.3.6 may include unspecified updates, enhancements, or bug fixes.