Oregon Revised Statutes State Legislative Department and Laws § 174.114

(a) An entity created by statute for the purpose of giving advice only to the legislative department and that does not have members who are officers or employees of the executive department or judicial department;

(b) An entity created by the legislative department for the purpose of giving advice to the legislative department, but that is not created by statute, if the document creating the entity indicates that the entity is a public body; and

(c) Any entity created by the legislative department by a document other than a statute and that is not an entity described in paragraph (b) of this subsection, unless the document creating the entity indicates that the entity is not a governmental entity or the entity is not subject to any substantial control by the legislative department.