Del. Code tit. 6, § 7711

When not all the parties to a dispute have filed an ADR certificate or have agreed to be bound by the Delaware Voluntary Dispute Resolution Act, such other parties may be given the opportunity to participate in the ADR proceedings by delivering to them the notice provided for in § 7710 of this title. Parties to the dispute who are not bound to participate in the ADR proceedings may elect to participate in the ADR by selecting an ADR Specialist in accordance with § 7709 of this title. Such selection shall constitute the agreement of the party to be subject to the provisions of this chapter for purposes of the dispute in which the election to participate is made. After the passage of the time for selection of the ADR Specialist, the ADR shall proceed without further notice to or involvement by those parties to the dispute who have not elected ADR.