Deal possible in Chicago teachers strike A contract agreement was "so close," a school board adviser said Friday morning, the fifth day of the strike by Chicago teachers. Teachers walked off the job Monday. 14 (UPI) -- The Chicago Teachers Union Friday announced the outline of a deal to end its weeklong strike, but said no vote will be taken on it until Sunday. Teachers walked off the job Monday in a dispute largely centered on whether teacher evaluations would be based on student test scores. "I'm pleased to report that the talks today were very productive," union attorney Robert Block said. We are still continuing to work out the details of the contract but we are hopeful we will have a complete agreement to present the union's House of Delegates by Sunday. The Chicago Tribune reported school board President David Vitale also was optimistic. "I'm pleased to tell you that we have in place the framework around the major issues," Vitale said. We have more work to do here. The heavy lifting is over. The general framework is in place. Talks were to resume Saturday as teachers planned a massive "Wisconsin-style" rally. Meanwhile, the teachers' union in Boston took out a full-page ad Friday in the Chicago Sun-Times, saying there were "a few flaws" in Chicago Mayor Rahm Emanuel's assessment of the Boston contract settlement regarding job protection, which he had referenced, WBBM-TV, Chicago, reported. Chicago teachers said they hoped a deal would be reached in the walkout that has affected 350,000 students and 26,000 teachers. Lewis told reporters earlier she was praying a deal could be reached. Please, yes, I'm hoping for Monday," she said. A deal would need to be approved by the union's full membership. If a deal is not ready, the delegates could send negotiators back to the table and meet again through the weekend for another update and possible vote, union spokeswoman Stephanie Gadlin told the Sun-Times. Delegates could decide to let students return to school while negotiators talk -- a possibility Emanuel and city aldermen have pushed. But Lewis said Thursday she preferred for the union to stay on strike until a deal is finalized. The union scheduled a "Wisconsin-style" labor rally at a Chicago park for noon Saturday. If it's not, it could be a show of strength for what the union calls a fair contract,' the Sun-Times said. Teachers' raises -- averaging 16 percent over four years at a cost of $320 million -- could not be rescinded due to an economic crisis. The board stripped teachers of a 4 percent raise last year, sparking union distrust of Emanuel. The teachers' strike is Chicago's first in 25 years and the first in a major city in a half-dozen years.