Many respondents detailed how classroom complexity can sometimes tie into disruptive and violent behaviour in their classrooms. Alberta's Aggression and Complexity in Schools team reported increased staff injuries and medical leaves, and unsafe environments for students and staff. When complexity escalatesIn the teacher questionnaire, CBC asked teachers what classroom complexity looks like. Jolene Helgason, an Edmonton public school teacher, presented a seminar during a teachers' convention last month. An elementary school teacher in the Calgary area wrote to CBC that parents will sometimes blame schools for their child's behaviour.