Milestone	Time
Mission Requirements Review	End of April 2005
System Requirements Review	Mid-June 2005
Preliminary Design Review followed by purchasing processes, detailed satellite design and production of engineering models of the satellite subsystems	November 2005
Bench tests of engineering models in SSC's laboratories	September 2006
Vibration tests of the two structural test models	December 2006
Guidance, navigation and control system simulations started in SSC's satellite laboratory	October 2006
Critical Design Review	January 2007
Delivery of flight hardware and experiments	June-December 2007
AIT (Assembly, Integration and Test) of the vehicles and their subsystems started	September 2007-April 2008
Advanced system tests of the satellites	May-October 2008
Environmental tests (vibration, thermal cycling, EMC etc)	October 2008-February 2009
Flight acceptance review at which it is decided if the satellites are ready for launch	May 2009
Spacecraft ready for transportation to launch site	November 2009
Launch from Yasny (Russia)	April 2010, but is delayed due to a delayed contract between Russia and Kazakhstan

AIT took place in the clean room facilities at SSC's engineering center in Solna. Environmental tests at system level were performed at Packforsk near SSC's premises and at Intespace in Toulouse, France.