After three bargaining sessions this week failed to produce a new contract, union officials announced Thursday night that Naperville School District 203 teachers will go on strike Tuesday.

The Naperville Unit Education Association said in a news release that the school board’s most recent proposal represented a major step backward.

“We have always said a strike is our last resort,” union President Ross Berkley said in a statement. “However, after months of bargaining, overwhelming community support and the board’s refusal to make meaningful progress, we have reached a point where we may have no other choice. As a result, we have set our official strike date.”

The union’s decision to send its members to the picket line came after its third bargaining session of the week ended Thursday ni

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