(Beaverton, OR) -- The Beaverton School District has requested that a state mediator join contract negotiations with teachers. The latest contact expired this year and teachers are continuing to work under that agreement. The school district says negotiations are complex. The district has created a website that details information including financial impact, compensation, employee benefits and working conditions. Last week, teachers conducted a "walk-in" with parents and students at all schools to show support for a new contract.