The Department of Education has written to the ASTI saying that unless they co-operate with the terms of the Lansdowne Road Agreement, a freeze on pay increments and other measures would be brought in from July 1st.
The Department of Education has told the secondary teachers union that unless it gives formal confirmation by June 30th that it will co-operate with the terms of the Lansdowne Road and previous agreements, the penalties will be brought in.
These include non-payment for supervision and substitution duties from September and loss of protection against compulsory redundancies.
Temporary teachers could also be hit, as the department has warned the ASTI that an agreement whereby they'd be considered for permanent positions after two years rather than four may be affected.
The executive of the ASTI is due to meet on Monday to discuss the issue.