in 11 a party was made up of 6 members, but an alliance was made of 3 party, so 18.Was the norm to be able to fight anything together in the open world.
In some instances you could have multiple alliances i can remember how many but 3+ alliances,i think 64 was max on dynamis ?.
anyways thats how it was when i played if my memory does not plays tricks on me.