The ASTI is Ireland's main second level teachers union and represents 18,000 teachers in community schools, community colleges, comprehensive schools and voluntary secondary schools attended by 80% of all second-level students.

The ASTI acts as a professional association voicing the concerns and interests of the teaching profession at second-level and as a registered trade union which protects teachers and fights for improvements in their pay and conditions of employment.

Included amongst our members are class teachers, school principals, deputy-principals, assistant principals, special duties teachers, temporary teachers, part-time teachers, home-school liaison teachers, guidance counsellors, remedial teachers and resource teachers.

The union represents teachers in:

   1. voluntary secondary schools
   2. community schools
   3. comprehensive schools
   4. community colleges

Established in 1909, the ASTI is a registered trade union which is affiliated to:

    * Education International
    * European Trade Union Committee for Education

The objects and aims of the ASTI are:

    * to promote second-level education
    * to unite and organise all second-level teachers
    * to promote and protect teachers' interests
    * to maintain and improve teachers' conditions of employment