The roots and the beginning of the JWS is an interesting one.
It really just started by a guy named C T Russell who was more of salesman of religious literature and developed an organization that was set about to distribute that literature.(IBSA)
Over the years the organization grew and expanded all over the world and with that growth more self empowerment developed toward the top orchestraters namely J Rutherford.
A highly controlling religious cult began to evolve , literature distribution was the core operation, with training sessions at Kingdom Halls and large public assemblies etc.
The studied were devised and molded to be the new public distributors and trainers themselves,
The strategy to assist those distribution endeavors were the set doctrines such as 1914 1925 , 1975 and so on.
Established behaviors and social directions were created to make the organization and each individual appear righteous in the eyes of god, though many left the organization accepting that many of the doctrines were really unrighteous or unchristian like.