A new study is raising concerns over the standard of Irish teaching and learning in primary and secondary schools.
The Chief Inspector's Report for 2010 to 2012 shows issues with almost one in four Irish classes at primary level.
The review says just under a third of Irish lessons in post primary schools are also "less than satisfactory".
The Chief Inspector's Report also finds issues with the teaching of 26% of maths classes in secondary schools.
The Education Minister Ruairi Quinn said the system needs reform.
He said: "It now gives us a baseline, half full half empty. I would concentrate on the full bit first because that is a positive story.
"I think we are indebted to the enthusiasm of teachers and it's reflected by the parents, even the students themselves.
"But does it point to the need for reform? Yes, it screams for the need for reform."