The New York Attorney-Representatives Certification of Form C-3 Or Notice of Controversy is a document used in the state of New York by attorneys representing clients in civil legal matters. The document, also known as Form C-3, is used to provide notice to the court of an attorney's representation of a particular party in a civil action. The document is typically filed along with the initial complaint or other court filing, but may also be filed anytime an attorney wishes to appear on behalf of a party. The document is intended to provide notice of an attorney's appearance in a civil action, as well as to certify the attorney's status as a New York attorney. The document must be signed by the attorney and notarized by a notary public. The document has two types: 1. New York Attorney-Representatives Certification of Form C-3: This is completed by attorneys when they are initially appearing on behalf of a party in a civil action in New York. 2. Notice of Controversy: This is completed by attorneys when they are later appearing as substitute counsel in a case, or when they are filing motions in a case. This document must also be signed by the attorney and notarized.