In companies with fifty or more employees, a collective agreement may determine the content of the job protection plan mentioned in articles L. 1233-61 to L. 1233-63 , as well as the procedures for consulting the social and economic committee and implementing redundancies. This agreement is signed by one or more representative trade union organisations having received at least 50% of the votes cast in favour of organisations recognised as representative in the first round of the most recent elections for members of the social and economic committee, whatever the number of voters, or by the works council under the conditions provided for inarticle L. 2321-9. The administration is informed without delay of the opening of negotiations with a view to the aforementioned agreement.