Board ceiling before partition or do both first?

[Casterbridge]

I have exposed ceiling joists and am creating a partition wall. Should I board the whole ceiling first befopre doing the partition, then board the walls, or do all the partitioning then board ceiling and walls at the same time?

 

[noseall]

We always board the ceiling first, making sure to fix any noggs where the stud header is between joists.

If this is being done pre electric first fix, we usually only board the section where the stud walls hit the ceiling, whist leaving acess for the leccy man in the remaining ceiling