The deadline for registration to sit this year's postponed Leaving Certificate exams has been extended from tomorrow to next Wednesday, Minister for Education Norma Foley has told the Dáil.

Ms Foley is taking questions on the errors discovered in this year's calculated grades process.

In a 10 minute statement she repeated the apology she made yesterday and again gave an outline of what had occurred. 

Ms Foley said Educational Testing Services had re-run all the results data through the corrected model, with the errors removed.

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She said once the review by ETS was completed and the results finalised the Department would have the full information on which students will benefit from improved grades.

She said this would be "as soon as possible".

Ms Foley confirmed that the contract for the model for calculated grades had not gone through normal procurement practices, due she said to the urgency of the task.

A Canadian company Polymetrika was contracted for the process.

Yesterday, Ms Foley said the mistakes discovered had been made by Polymetrika. 

Labour's Aodhán Ó Ríordáin questioned why the Department of Education had not "road-tested" the model.

"This was one of the biggest educational decisions ever made not to go ahead with the Leaving Cert" he said, asking did no one in the department say that the system should be road-tested first.