Woodridge teachers authorized their union's negotiating team to issue a 10-day strike notice if the team decides it's necessary .
The Woodridge Education Association, which represents 147 employees, has been negotiating a new contract since April.
A federal mediator was called in to help with negotiations in June. The contract expired at the end of July and the last meeting with the mediator was on Oct. 7, according to the union.
The WEA is affiliated with the Ohio Education Association and National Education Association.