Some schools in Northern Ireland have reopened after strikes took place on Wednesday morning.
Teachers from five unions took part in the half-day industrial action, mainly due to a long-running dispute over pay.
Teachers in Northern Ireland have not had a pay increase for nearly three years.
Many teachers in England, Scotland and Wales now earn thousands of pounds more than their counterparts in Northern Ireland at the same grade.
On Wednesday, the National Association of Head Teachers (NAHT) joined four unions on strike for the second time this year having not previously taken industrial action in its 126-year history.
The half-day strike will be followed by a further four days of industrial action after Christmas.
Rebekah Mitchell, a geography teacher in Londonderry's Lisneal College, joined the profession five years ago because of her passion for the job.
Now, the 27-year-old joined the picket line determined to secure a better deal for her and her colleagues.
"For me this is about equality," she told BBC News NI.
