In an effort to keep costs down and build good will, NASA is welcoming other countries to join the effort, though NASA will be doing the actual design work.
Once on board, Cassidy, Vinogradov and Misurkin will join the rest of the crew of their mission, known as Expedition 35: Canadian Chris Hadfield, NASA astronaut Tom Marshburn, and Russian cosmonaut Roman Romanenko, all of whom have been on the station since December.