Article IV: Selection of Candidates 1. Selection of flight candidates will be based on mutual agreement prior to any announcement. Candidates selected will be current, active members of each side's astronaut or cosmonaut corps. 2. Flight candidates selected will have previous space flight experience. The cosmonauts selected for training shall have sufficient knowledge in verbal and written English. The NASA astronauts selected for training shall have sufficient knowledge in verbal and written Russian. Information that each side's candidates meet the criteria in this Article shall be exchanged prior to any announcement on crew selections.