Artikel 2

1. The programme referred to in Article 1 above shall be broken down into two Phases. It was preceded by a preparatory programme definition Phase (Phase 1), already completed. These two Phases – described in detail in Annex A to this Arrangement – are as follows:
(a) A technological and experimental Phase, during which the communication techniques and the spacecraft technologies required for the programme will be developed on the ground and tested aboard experimental and pre-operational satellites (Phase 2). This Phase may be reviewed, at any appropriate moment during its execution, with a view to the inclusion of a sub-Phase (2bis) comprising further work on advanced techniques and specialised studies.
(b) A Phase devoted to the development of two operational flight units together, if necessary, with the launching, and evaluation in orbit, of a prototype model, and on its completion to making these operational flight units available to the potential users, one of them in orbit and the other on the ground, on terms to be agreed between the Participants and the users (Phase 3).
2. The decisions to proceed to sub-Phase 2bis and to Phase 3 shall be taken in conformity with the provisions of Article 5 below.