Del. Code Ann. tit. 6, § 7710
ADR proceedings are initiated by written notice to the other parties to a dispute who have filed an ADR certificate in accordance with § 7704 of this title or who have agreed to be bound by the ADR requirements of this chapter. The notice shall state in summary form:
A failure to send such a notice to a person who has an interest in the dispute shall not prevent the ADR proceedings from going forward between or among parties who did receive such notice.