It was a set development team for the first four games: Ogre Battle, Tactics Ogre, Final Fantasy Tactics, and Vagrant Story. All four games have pretty much exactly the same people working on them. Final Fantasy Tactics, Final Fantasy XII, Final Fantasy XII: Revenant Wings, and Final Fantasy Tactics A2 came next but these last four games have slightly different teams, because the team has partially fragmented, and now Yasumi Matsuno, the leader has left. Motomu Toriyama, the main FF director now(X, X-2, XIII) is directing FF XII: RW. I don't remember who's directing FF T A2, maybe he'll be the new leader now.
I'm excite~!