The union filed a lawsuit against the board of education after the board gave schools CEO Ron Huberman the authority to lay off teachers based on performance. The union argued that layoffs should be based on seniority. The judge agreed.
"It says that tenure is real and you can't just fire a teacher illegally," said Karen Lewis, Chicago Teachers Union.
Chicago Public Schools issued a statement saying it, "disagrees with aspects of the ruling, but the district is pleased that the court found that CPS is not required to restore positions eliminated as the result of budget cuts."