OrgLaw IV.1: The Cosa is the national legislative assembly, and is composed of a number of seats apportioned among political parties based on their performance in the General Election, as well as any additional seats authorized by this Organic Law.
OrgLaw IV.2. Based on the final results of the General Election, the Secretary of State shall calculate the apportionment of seats among the parties, hereinafter referred to as "party seats".
OrgLaw IV.2.1 The party seats shall total 200, or another number which may be set by law, with the provisos that any such change will not take effect until the next election following the passage of a calendar year; and that this number may never be less than twice the number of Senators minus one.
OrgLaw IV.2.2. Each party shall receive a percentage of party seats as equal as possible to its percentage of the popular vote, but each party shall receive a whole number of seats, and in turn, each party shall assign these seats to individuals, in accordance with law. The Secretary of State shall employ whatever mathematical formulae and calculations in the apportionment of seats as are set by law, or, in the absence of such law, as will best reflect the intentions of this Organic Law. The Uppermost Cort shall be the final judge in case of mathematical disputes.
OrgLaw IV.2.3. Only registered political parties may obtain party seats. Parties which win votes but are not registered may not assume their seats in the Cosa until they register. The process to register a party shall be defined by law. The Secretary of State may request from all parties a registration fee, to be set by law, to cover the cost of the election. This fee shall be uniform for all parties.
OrgLaw IV.3. In the case of vacant party seats occurring between elections, the Secretary of State shall inform the King and the leader of whatever party held the vacant seat. The King shall appoint a replacement to each vacancy. If the seat belonged to a party with a functioning party leader, the King must appoint as a replacement whichever person shall be so designated by that party's leader. If there is no functioning party leader, or if the party leader refuses to designate a replacement, the King shall appoint the replacement according to his own best judgment.
OrgLaw IV.4.1: In addition to the seats apportioned between parties after a General Election, the Secretary of State shall assign one Cosa seat to any citizen who becomes eligible to vote after the most recent Election Deadline but before the dissolution of the Cosa, upon the request of such citizen, up to a maximum number as this Organic Law might provide. Any additional seat so assigned shall cease to exist should its holder vacate or be removed from the seat and shall not be subject to the procedures for filling vacancies in the Cosa, and shall also cease to exist upon the dissolution of the Cosa.
OrgLaw IV.4.2 The maximum number of seats that may be assigned to new citizens between general elections shall be 7.5% of the seats apportioned between parties, rounded up to a whole number of seats.