1
Mr Williams said very few of the prefabricated classrooms were new buildings and many were 30 years old.
2
He said the prefabricated classrooms were "modern learning environments" - a new style of open-plan classroom.
3
Newtown students have been in prefabricated classrooms since its main block was demolished due to earthquake risk in 2011.
4
Two prefabricated classrooms have been burned and 63 windows broken at St Joseph's Presentation College, in Lucan, Co Dublin.
5
Since then the school has grown to 389 pupils who are catered for in the original building and prefabricated classrooms.