A phased approach to get children back to schools in Wales from the end of this month will see only a third of pupils present at any one time.
Class sizes will be shrunk down with children having staggered start and break times, under new Welsh Government guidelines published today.
It comes as schools have started sending questionnaires out to parents to see if they are willing to send their children back when gates start to reopen again on June 29.
Some schools have proposed reducing classes down to just a handful of children with desks two metres apart.
Breaks will be in small numbers with no interaction between year groups and learning days are likely to be reduced to allow for deep cleans.
Movement around the schools will also be kept to a minimum.
The Welsh Government said it is expected that this will mean, at most, a third of pupils present at any one time.
The 'Keep Education Safe' guidance aims to help schools "check-in, catch up and prepare for summer and September" and also offers advice for further eduction settings which are due to restart limited on-campus learning from June 15.
Guidance is also being published for childcare settings today to support the sector in opening up more widely and ensuring providers can operate safely.
Education minister, Kirsty Williams said: “We know that such a long period away from school, friends and the classroom will have a detrimental impact on the wellbeing and learning of many young people.
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"That is why we have taken the decision that the majority of learners will be able to check in, catch up, and prepare for the summer and September.
“Striking a balance between providing national public health guidance and enabling local flexibility has been critical in the development of this guidance.
"More detail and support will be developed as detailed plans are worked up by schools and local authorities."
She added: “I am grateful to the headteachers, staff, unions and parents who have already been sharing their plans and proposals.
"We are working together to ensure that this opportunity is available to the vast majority of pupils and parents in a safe, structured and sensible way.
“As we continue to keep Wales safe, we will continue to develop the guidance over the summer term and into September, while ensuring it reflects the latest medical and scientific advice.
“The health and wellbeing of learners and staff is, as always, our primary concern.
"Schools, colleges and other settings are working hard to plan for the return of their learners and to put the appropriate safeguards in place.
"The guidance published today will support them in doing this.
“Working together, we will secure equity and excellence for learners as they check in, catch up and prepare for the summer and September."
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