Teachers across Northern Ireland are set to take part in a 12-hour strike.
The stoppage - on the same day thousands of health workers are also set to walk out - will run until midday on Tuesday in a dispute over pay and the future of the profession.
Members of each of the five main teachers' unions in NI are to take part and schools will reopen at noon to provide free school meals.
Ian McGonigle, NEU NI president, said pay for teachers has fallen by almost 40% in real terms since 2010.
"We are not only striking for ourselves, but for the future of the teaching profession and our colleagues too," he said.
