Determined to control the bargaining clock and “call the question” on what could be the second walkout since Mayor Rahm Emanuel took office, the Chicago Teachers Union’s House of Delegates on Wednesday set a strike date of Oct. 11.

Determined to control the bargaining clock and “call the question” on what could be the second walkout since Mayor Rahm Emanuel took office, the Chicago Teachers Union’s House of Delegates on Wednesday set a strike date of Oct. 11.