SCHOOLS are being encouraged to devise new `clustering' arrangements to provide supervised learning.
Many have been offering safe and welcoming environments for children of key workers and vulnerable young people.
On Friday, there were 697 children being looked after in 406 schools - less than two pupils per school.
Education Minister Peter Weir has been analysing the situation daily and has now written to principals.
He said all schools and pre-school settings "should be open to accommodate" these children.
In a letter, he said he was aware that many schools had been open but were concerned about the sustainability of the arrangements.
For example, Strandtown, Belmont, Greenwood and Orangefield primary schools were all open in east Belfast on Monday.
"We also need to prepare for the coming weeks when the pressure on key workers is most likely to increase," Mr Weir wrote.
"There is also the possibility that staff who are currently providing this vital service in schools may themselves be sick or be required to self–isolate due to a family member being ill."
His department has provided a policy and guidance to facilitate schools that wish to move to local clustering arrangements.
This would allow children to attend one school in an area, regardless of whether or not they are enrolled there.
"We need to ensure we are ready to provide as many places as required against this uncertain backdrop, this may include providing places for children at weekends, Easter and other holiday periods," Mr Weir added.
