1. The negotiated procedure shall be launched by an invitation to participate, which shall state the grounds for the use of the negotiated procedure. In the participation stage of the procedure, any interested economic operator shall have the right to submit a request to participate, except in the case provided for in paragraph 2.
2. Sub-central contracting authorities may also use a prior information notice as a call for competition in accordance with the rules laid down in Article 82(3).
3. The contracting authority may set the range of the number of tenderers in negotiated procedures as well in accordance with the rules laid down in Article 82(4)-(5), save that the upper limit of that range shall include at least three tenderers.
4. In negotiated procedures Article 83 shall also apply.