EU leaders agreed in December 2008 on transitional arrangements concerning the composition of the Parliament, should the Lisbon Treaty enter into force and thus change the configuration of EP seats by temporarily increasing the overall number of Members so as to respect a demographic and representative balance.
ES valstu un valdību vadītāji 2008. gada decembrī vienojās par pagaidu pasākumiem laikā starp Eiropas Parlamenta vēlēšanām un Lisabonas līguma iespējamo stāšanos spēkā.