inar ▁dis band ed ▁in ▁ 1 9 8 2 , ▁reporting ▁that ▁its ▁members ▁" could ▁not ▁agree ▁on ▁a ▁single ▁thing ", ▁leading ▁some ▁to ▁claim ▁the ▁problem ▁is ▁un sol v able . ▁No ▁single ▁theory ▁offers ▁a ▁complete ▁solution . ▁There ▁are ▁complex ▁and ▁important ▁difficulties ▁that ▁create ▁challeng es ▁to ▁every ▁theory . ▁One ▁example ▁is ▁Bas il ▁Christopher ▁Butler ' s ▁challenge ▁to ▁the ▁legit im acy ▁of ▁two - source ▁theory , ▁arg uing ▁it ▁contains ▁a ▁L ach mann ▁f alla cy ▁that ▁says ▁the ▁two - source ▁theory ▁los es ▁coh es ion ▁when ▁it ▁is ▁acknowled ged ▁that ▁no ▁source ▁can ▁be ▁established ▁for ▁Mark . ▁ ▁Form ▁criticism ▁▁ ▁Form ▁criticism ▁began ▁in ▁the ▁early ▁tw enti eth ▁century ▁when ▁the olog ian ▁Karl ▁Ludwig ▁Schmidt ▁observed ▁that ▁Mark ' s ▁G ospel ▁is ▁composed ▁of ▁short ▁units . ▁Schmidt ▁assert ed ▁these ▁small ▁units ▁were ▁rem n ants ▁and ▁evidence ▁of ▁the ▁or al ▁tradition ▁that ▁preced ed ▁the ▁writing ▁of ▁the ▁g osp els . ▁Bible ▁scholar ▁Richard ▁Bau ck ham ▁says ▁this ▁" most ▁significant ▁insight ," ▁which ▁established ▁the ▁foundation ▁of ▁form ▁criticism , ▁has ▁never ▁been ▁ref uted . ▁Hermann ▁G unk el ▁( 1 8 6 2 – 1 9 3 2 ) ▁and ▁Martin ▁D ib el ius ▁( 1 8 8 3 – 1 9 4 7 ) ▁built ▁from ▁this ▁insight ▁and ▁pione ered ▁form ▁criticism . ▁Form ▁criticism ▁breaks ▁the ▁Bible ▁down