DIMAPUR, OCTOBER 15 (MExN): The Nagaland SSA Teachers Association (NSSATA) is set to begin its first phase of agitation from October 17 by boycotting their classes. This was informed in a press note from the NSSATA today. It may be noted that the seven day ultimatum served by NSSATA to the state government to respond to their grievances expired on October 15.