I just happened to have to write an email to my DS's teacher so I can cut and paste the scribing accommodations we have for him for you right now:

"Primary lined paper will be provided for journaling, Writers Workshop, and special area assignments that require more than 3 lines of writing... for assignments for writing assignments 3 lines or greater."

"On tasks of two lines or less, DS will be encouraged, but not required, to write independently... for writing assignments of two lines or less."

"For writing tasks three lines or longer, DS and a scribe may alternate writing 1-2 sentences each. Scribe will do all writing after Ben completes a maximum of 4 handwritten lines."