Section 300.509 - Model forms(a) Each SEA must develop model forms to assist parents and public agencies in filing a due process complaint in accordance with §§ 300.507(a) and 300.508(a) through (c) and to assist parents and other parties in filing a State complaint under §§ 300.151 through 300.153 . However, the SEA or LEA may not require the use of the model forms.(b) Parents, public agencies, and other parties may use the appropriate model form described in paragraph (a) of this section, or another form or other document, so long as the form or document that is used meets, as appropriate, the content requirements in § 300.508(b) for filing a due process complaint, or the requirements in § 300.153(b) for filing a State complaint. Authority: 20 U.S.C. 1415(b)(8)