Annex III: Optional Programmes Covered by Article V.1 (b) of the Convention Article I 1. If a proposal for the carrying out of an optional programme covered by Article V.1 (b) of the Convention is made, the Chairman of the Council shall communicate it to all Member States for examination. 2. Once the Council has, in accordance with Article XI.5 (c) (i) of the Convention, accepted the carrying out of an optional programme with the framework of the Agency, any Member State that does not intend to take part in the programme shall, within three months, formally declare that it is not interested in participating therein; the participating States shall draw up a Declaration which, subject to Article III.1, shall set out their undertaking in respect of (a) the Phases of the programme; (b) the conditions under which it is to be carried out, including the timing, the indicative financial envelope and sub-envelopes relating to Phases of the programme, and any other provisions for its management and execution; (c) the scale of contributions determined in accordance with Article XIII.2 of the Convention; (d) the duration and amount of the first binding financial commitment. 3. The Declaration shall be transmitted to the Council for information, together with draft implementing rules submitted to it for approval. 4. If a participating State is unable to accept the provisions set out in the Declaration and implementing rules within the time limit laid down in the Declaration, it shall cease to be a participating State. Other Member States may subsequently become participating States by accepting these provisions in accordance with conditions to be determined with the participating States. Article II 1. The programme shall be executed in accordance with the provisions of the Convention and, unless otherwise stipulated in this Annex or in the implementing rules, with the rules and procedures in force in the Agency. Decisions of the Council shall be taken in accordance with this Annex and the implementing rules. Failing any specific provisions in this Annex or in the implementing rules, the voting rules laid down in the Convention or the rules of procedure of the Council shall apply. 2. Decisions on the start of a new Phase shall be taken by a two-thirds majority of all participating States, provided that this majority represents at least two-thirds of the contributions to the programme. If the decision to start a new Phase cannot be taken, the participating States that wish, nevertheless, to continue with the Programme shall consult among themselves and determine arrangements for such continuation. They shall report accordingly to the Council, which shall take any measure that may be required. Article III 1. If the programme includes a project definition phase, the participating States shall, at the end of the phase, reassess the cost of the programme. If the reassessment shows that there is a cost overrun greater than 20% of the indicative financial envelope referred to in Article I, any participating State may withdraw from the programme. The participating States that wish, nevertheless, to continue with the programme shall consult among themselves and determine the arrangements for such continuation. They shall report accordingly to the Council, which shall take any measures that may be required. 2. During each Phase, as defined in the Declaration, the Council shall, by a two-thirds majority of all participating States, adopt annual budgets within the relevant financial envelope or sub-envelopes. 3. The Council shall lay down a procedure enabling the financial envelope or sub-envelopes to be revised in the event of price-level variations. 4. When the financial envelope or a financial sub-envelope has to be revised for reasons other than those referred to in paragraphs 1 and 3, the participating States shall apply the following procedure: (a) No participating State shall be entitled to withdraw from the programme unless the cumulative cost overrun is greater than 20% of the initial financial envelope, or of the revised envelope defined in accordance with the procedure laid down in paragraph 1. (b) If the cumulative cost overrun is greater than 20% of the relevant financial envelope, any participating State may withdraw from the programme. Those States that wish, nevertheless, to continue with the programme shall consult among themselves, determine the arrangements for such continuation and report accordingly to the Council, which shall take any measures that may be required. Article IV The Agency, acting on behalf of the participating States, shall be the owner of the satellites, space systems and other items produced under the programme as well as of the facilities and equipment acquired for its execution. Any transfer of ownership shall be decided on by the Council. Article V 1. Denunciation of the Convention by a Member State shall entail the withdrawal of that Member State from all the programmes in which it participates. Article XXIV of the Convention shall apply to the rights and obligations arising out of these programmes. 2. Discontinuations under Article II.2 and withdrawals under Article III.1 and III.4 (b) shall take effect on the date on which the Council receives the information referred to in those Articles. 3. A participating State that decides not to continue with a programme under Article II.2, or withdraws from a programme under Article III.1 et III.4 (b), shall retain the rights acquired by the participating States up to the effective date of its withdrawal. Thereafter, no further right or obligation shall arise from the remaining part of the programme in which it no longer participates. It shall remain bound to finance its share of the payment appropriations corresponding to contract authority approved under the budget for the current or previous financial years and relating to the programme Phase whose execution is in progress. However, the participating States may unanimously agree, in the Declaration, that a State which decides not to continue with, or withdraws from, a programme shall be bound to finance its total share of the initial envelope or the sub-envelopes of the programme. Article VI 1. The participating States may decide to discontinue a programme by a two-thirds majority of all participating States representing at least two-thirds of the contributions to the programme. 2. The Agency shall notify the participating States of the completion of the programme in accordance with the implementing rules; these implementing rules shall cease to be in force upon receipt of such notification.