Civil servants and consultants involved in the creation and running of the RHI scheme will provide evidence between now and Christmas, Mr Scoffield tells the inquiry.
Precise details as to who will be called after that and when are yet to be determined.
But both Arlene Foster and Jonathan Bell - former enterprise ministers - will appear next year, as will a series of current and former DUP advisers.
Those will include Timothy Cairns, Dr Andrew Crawford (above), Stephen Brimstone, John Robinson, and Timothy Johnston.
Witnesses will appear in sequence - that is, they will give evidence in the chronological order of their involvement in the scheme - in order to make its work as efficient as possible.