Thanks for the referral but I’m like everybody else on this topic. CCP has never released any info about the amount or type of missions available in the Storyline pool.
Personally I’d like to think a Storyline Agent would be coded to only offer missions from their Division, however from my experience I’ve found that not to be the case. Also it seems to me the Storyline pool has more encounter missions than any other type.
I think CCP has set it up so that the majority of the time the type of Storyline mission that’s offered will be opposite from the previously completed regular missions. I’m not sure but it could be based on just the 16th mission. Meaning that if you’re doing regular Distribution missions, the Storyline offer will be a Security mission, etc.
Anyway, @Exia_Aturin, if you’re looking to gain standing, there’s easier ways to do that than grinding 16 missions for a Storyline mission. Check out the ‘Faction Standing Repair Plan’ thread for more info.