up ▁system ▁should ▁it ▁be ▁required . ▁ ▁In ▁the ▁first ▁pay ▁period ▁for ▁ 2 0 1 3 , ▁ 1 6 4 7 ▁teachers ▁were ▁over pa id , ▁ 2 0 6 ▁were ▁under pa id ▁and ▁ 3 9 ▁were ▁not ▁paid ▁at ▁all ▁- ▁affect ing ▁ 2 8 6 ▁schools . ▁These ▁errors ▁were ▁the ▁result ▁of ▁a ▁brand ▁new ▁gl itch ▁introduced ▁into ▁Nov op ay ▁as ▁part ▁of ▁Tal ent 2 ' s ▁attempts ▁to ▁fix ▁the ▁system . ▁Comment ing ▁on ▁the ▁new ▁f law , ▁Steven ▁Joy ce ▁said : ▁" I ▁am ▁ad vised ▁that ▁it ▁was ▁a ▁one - off ▁event ▁that ▁has ▁been ▁corrected ." ▁In ▁April , ▁Price water house Co op ers ▁announced ▁ 3 6 3 ▁defect s ▁had ▁been ▁fixed ▁since ▁the ▁end ▁of ▁February , ▁but ▁another ▁ 1 7 2 ▁had ▁emer ged . ▁Since ▁February , ▁the ▁percentage ▁of ▁teachers ▁affected ▁by ▁errors ▁was ▁dro pping ▁with ▁each ▁success ive ▁pay ▁round ▁- ▁going ▁from ▁ 2 . 2 % ▁( and ▁affect ing ▁ 6 2 8 ▁schools ) ▁in ▁the ▁ 2 3 rd ▁pay ▁period ▁to ▁ 0 . 4 3 % ▁of ▁staff ▁( aff ect ing ▁ 2 3 2 ▁schools ) ▁in ▁the ▁ 2 6 th ▁pay ▁round . ▁ ▁Cost ▁ ▁By ▁the ▁end ▁of ▁April ▁ 2 0 1 3 , ▁the ▁cost ▁to ▁the ▁Government ▁of ▁fixing ▁Nov op ay ▁had ▁ris en