Madison Teachers, Inc. Solidarity Newsletter, via a kind Jeannie Bettner email (PDF):

JUST CAUSE does not mean “just because”. It sets standards and procedures which must be met before an employee can be disciplined or discharged. Fortunately, for those in MTI’s bargaining units, all have protection under the JUST CAUSE STANDARDS. They were negotiated by MTI to protect union members.
There are seven just cause tests, and an employer must meet all seven in order to sustain the discipline or discharge of an employee. They are: notice; reasonableness of the rule; a thorough and fair investigation; proof; equal treatment; and whether the penalty reasonably meets the alleged offense by the employee.
MTI’s various Contracts enable a review and binding decision by a neutral arbitrator as to whether the District’s action is justified and the burden of proof is on the District.
These steps are steps every employer should have to follow. They are not, but MMSD must follow them because of MTI’s Contracts. Governor Walker’s Act 10 destroys these protections. MTI is working to preserve them.