Activities such as notifications, exchanges of observers, prior notification of military movements, and visits by observers. Accompanied the activities of the Conference for Security and Cooperation in Europe and were first introduced by the Helsinki Final Act in 1975 to reduce the dangers of armed conflict, misunderstanding, or miscalculation of military activities. Many of these features are now embedded in arms control and other agreements in the form of data exchanges/declarations, missile launch notifications, inspection activities, and voluntary presentation for national technical means.