Education Secretary Michael Gove and Ofqual chief Glenys Stacey are to give evidence to MPs about this summer's GCSE English grading crisis.
They will appear before the cross-party Commons Education Select Committee in two different sessions next week.
The general secretaries of England's two biggest headteachers' unions, the Association of School and College Leaders (ASCL) and the National Association of Head Teachers (NAHT), will also give evidence.
Committee chairman Graham Stuart said: "As the independent regulator, Ofqual is accountable to Parliament through my committee. We are also keen to hear from headteachers on this important topic before we take evidence from the Secretary of State on Wednesday September 12."
Ms Stacey, Ofqual's chief regulator, will give evidence on Tuesday, along with headteachers and ASCL general secretary Brian Lightman and NAHT general secretary Russell Hobby.
The move comes amid the continuing furore over the grading of this year's GCSE English exams, when it emerged that GCSE English grading boundaries had been altered between January and June.
Headteachers have predicted that thousands of pupils have been affected by the move, with concerns centring around those who were expected to get a C but ended up with a D grade.
Overall, 63.9% of GCSE English exams were awarded at least a C, a 1.5% drop on the year before.
On Friday, Ofqual announced it would be inappropriate for either of the sets of exams to be regraded as teaching unions continued to threaten legal action over the issue.
Earlier this week, Mr Gove refused to intervene in the row as he warned GCSEs are "unfit for purpose". Ministers should not "meddle" in decisions made by Ofqual, he said.