Any classical decision requiring the concurrence of the synodical deputies be made in the presence of delegates from all the churches which are members of the classis in which the action is being taken. If a classis contracta is necessary because of justifiable circumstances, to be determined in consultation with the deputies, a contracted classis shall never be convened with fewer than half the churches represented. A quorum for a classis contracta shall be half the churches of a classis plus one.
(Acts of Synod 2000, p. 668)