AA: In accordance with Article 21 of the Agreement, it will enter into force thirty days after ratification (or acceptance, approval or accession) of the Agreement by at least 55 Parties representing at least 55% of total greenhouse gas emissions and will be implemented. This is called the «bi-trigger» approach to entry into force. The table does not contain certain elements for a simple or medium layout. This is based on the assumption that the provision is so simple that these elements are not necessary. If, when preparing a simple statement of intent, it is likely that some or all of these types of elements are indeed necessary, it is likely that the provision itself should be considered medium or complex and not simple or average. The choice of service contracts (MOU, MA and/or SLA) would be regulated accordingly.