Co-operation to prevent circumvention ensures joint investigations and prompt consultations when rules of origin are suspected under the trade pact. Co-operation to determine origin requires Parties to specify inputs in the Certificate of Origin, take legal and administrative measures against false declarations or falsified documents, and co-operate fully-consistent with domestic law-to investigate suspected circumvention, including facilitating joint plant visits and representative contacts; a Party alleging circumvention may request prompt consultations to seek a mutually satisfactory solution.