The project Operator Site had its main research activities focused on testing and developing display interface concepts, aimed to improve operator function and performance by means of interface improvements for a selection of settings or platforms. Primarily auditory, tactile, and visual displays interfaces were in focus. The overall goals included contributing to the improvement of operator situation awareness and performance, with lowered or maintained mental workload, in tasks more or less critical for the success of specific parts of operations. We employed a variety of settings and operators. The most apparent specifications of them, in experiments and other types of studies, were the driver in Combat Vehicle 90, the pilot in Gripen fighter aircraft, the reconnaissance soldier with unmanned ground vehicle, the rifle soldier as related to Combat Boat 90, and the fire and rescue command operator in command centre. The report gives an overview of the main research efforts invested in Operator Site and of a small part of relevant research conducted elsewhere (as referred to). We attempt to convey the overall research activities of Operator Site with general results from experiments and other types of studies.