学級崩壊 gakkyu hokai = 'classroom collapse'
Shiga Univ. to train teachers to fight classroom chaos
Kyodo / July 07
Shiga University will offer four new courses next spring designed to train would-be teachers to resolve pervasive school-related problems such as classroom chaos and truancy....
Education expert Naoki Ogi said existing programs to train teachers generally put excessive emphasis on teaching subjects even though bullying, truancy, severe disruptions and other serious problems are becoming prevalent.
--Also refer to the education research here and here.