ASTI figures are being disputed by members following a surge in defiance against a ban on Junior Cert reform training.
The Association of Secondary Teachers in Ireland has disputed figures that suggest that members have defied this ban.
The figures suggest one third are defying this ban despite being ASTI members.
More than 5,000 members of the ASTI are registered for the training despite a union ban.
Their membership comes to 18,000 in Ireland.
The General Secretary of the ASTI, Kieran Christie, says there are a number of reasons why the figures may be skewed.
“We would dispute those figures, many of the teachers you are discussing may have registered prior to the ASTI directive coming into effect in March 2014.”