Opposition politicians have called for transparency around the calculated grades system for this year's Leaving Certificate exams. 

The graded results for the State exams are due to be published on 7 September.

It comes after a plan to issue calculated grades to GCSE students in Northern Ireland was scrapped with Stormont's Education Minister Peter Weir announcing that students will instead receive grades that have been predicted by their teachers.

Sinn Féin's Education Spokesman Donnchadh Ó Laoghaire said there was a "real lack of transparency" around the grading system here.

He said the Minister for Education Norma Foley must demonstrate how the Irish model differs to that in the UK and that it will ensure fairness in the grading of students.

He said he wrote to the minister two months ago, asking for the model to be published.

Mr Ó Laoghaire told RTÉ’s Today with Sarah McInerney that standardisation could result in some students failing a subject and missing out on the course they want. 

He said that he does not support school profiling and the focus should have been in maximising third-level places and giving as many people as possible their first choice.

Meanwhile, Labour's Education Spokesman, Aodhán Ó Riordáin said the system being used by the Government for the calculated grades is "falling apart" and he called for the system of school profiling to be scrapped. 

Green Party TD Patrick Costello said that following the controversy in the UK with standardised grading people need to be able to trust the process here and know they are being treated as fairly as possible and "for that to happen we need transparency". 

Deputy Costello said he has asked the minister to explain what kind of algorithm is being used so that it can be examined and deemed to be fair and equitable. 

He said schools in disadvantaged areas of the UK had significantly more students downgraded, while those in more affluent schools had more students given higher grades.

Earlier, Carl Cullinane, Head of Research and Policy at the Sutton Trust, said the Government has "a big call" to make before the release of the Leaving Certificate grades.

He pointed out that all four nations of the UK had similar systems for predictive grading and all four eventually had to backtrack under public pressure. 

He said the Government has the benefit of extra time to take stock of the situation. 

On the face of it, he said, the Irish system does sound slightly different and hopefully lessons will have been learned from mistakes made in the UK. 

Mr Cullinane said that percentage marks, instead of grades, should make a big difference.