The Blue Book foresaw the firing of some 435 sounding rockets and the successful development and launching of 17 satellites in the 8 years covered by the ESRO Convention, namely 11 small satellites, 4 space probes, and 2 large satellites. It was assumed that 2 launchings would be required to orbit one successful spacecraft, so the number of satellite and space probes launchings budgeted for was doubled. The total cost of the satellite programme was estimated at 733.5 million ₣, of which 450 million ₣ was for launchers and launch operations and 283.5 million ₣ for spacecraft development.