@V
In your master's thesis, or whatever work it may be, please do not continually refer to it as the "elder arrangement"... that is cultlike terminology from a PIMI perspective.
All schemes that WT fabricates are pitched as "the arrangement"... "Jehovah's arrangement"...
From an external/secular perspective, there are more comprehensive descriptions for the "elder arrangement", one of which is: CLERGY
others might be:
elder rank
elder echelon
elder schema
et al...