Sixty-four per cent of Third Year students in Irish second-level schools experience classes of 25 students or more and 16% experience classes of 30 students or more, according to a 2007 survey.

Large class sizes affect the ability of teachers to meet the needs of all pupils.

Students with difficulties can be helped much more effectively in a class of 20 than in a class of 30.

Modern syllabi, which include practical work, demand smaller class sizes to support effective learning.

Emphasis on oral communication in language classes demands smaller class sizes to support verbal interaction.