Former ASTI president Ms Bernadine O'Sullivan has launched a strongly-worded attack on senior figures within the union.
The move is certain to exacerbate the bitter internal divisions in the run-up to next week's annual conference.
On her website bernadetteosullivan.com, Ms O'Sullivan blames senior figures in the union - including president Ms Catherine Fitzpatrick, general secretary Mr Charlie Lennon and former president Mr Don McCluskey - for the current problems over the school supervision issue, where ASTI's strategy has been widely criticised.
In a robust defence of her role in the union, she says all of the strategies for industrial action adopted by ASTI in the recent past were decided by the union's executive and standing committee from a menu brought to a strategy committee by "a paid official of the union". This is an apparent reference to Mr Lennon.
She continues: "These strategies were decided when Mr McCluskey was president and not, as has been persistently reported, when Ms O'Sullivan was president."
On the current ASTI ban on supervision in schools, she writes :
"The current situation in schools...is a direct result of a motion brought by Mr McCluskey and the ASTI treasurer, Mr Michael Ward, on behalf of the officers - President Fitzpatrick, Mr McCluskey, Mr Ward and Mr. Lennon".
Ms O'Sullivan is critical of the supervision ban which, she says, has distracted attention from the union's pay campaign.
Her criticisms appear to have been provoked by a recent Irish Times interview in which the ASTI president Ms Fitzpatrick, was critical of current union strategy.
It is also a response to criticism by 10 former ASTI presidents, including Mr McCluskey, of ASTI strategy.
Ms O'Sullivan says her document has been drawn up in response to "public questioning of our strategy by officers and members of our union".
Her new website is part of her campaign for the NUI Senate elections.
She is set to be formally nominated as the ASTI candidate at the Bundoran, Co Donegal, convention.
Ms O'Sullivan also poses a series of questions for the leadership including:
Why are they questioning our policy in the run up to our convention when the focus should be on the Government's failure to address our just pay claim?;
Why did an officer of the union not reply to Joe O'Toole's attack on a sister union?;
Why are our officers not pointing out positive side effects of our pay campaign?