More schools are being forced to employ unqualified or casual teachers to manage supply issues.
Over 600 roles are still vacant as the academic year begins, with teacher unions calling for action from the Government.
77 per cent of second-level schools had no applications for an advertised position last year, according to the ASTI.
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President of the association and native of Creggs, Padraig Curley says the shortages are having a number of knock-on effects:
