A date has been set for a Belfast High Court probe into claims that children living in Co Donegal have been given school places in Derry, to the exclusion of local children.
The case was originally brought on behalf of two girls who were refused places at St Cecilia's College, an all girls grammar school, in the Creggan area of Derry.
Later a third set of parents joined the action.
An earlier hearing was told that some Derry families had moved to Donegal but were using addresses of grandparents in order to secure school places, a practice that had become known locally, as 'grannying'.
The case will be heard on 19 December.
