Final Fantasy Tactics Advanced

Clans

Story Battle Mission (Sword Icon) - Always the first on the list and usually more expensive than the others, these quests progress the story and will generally unlock a new area on the World Map.

Battle Mission (Sword Icon) - The "standard" quest, these involve fighting a battle in which your opponents are generally monsters.

Dispatch Mission (Paper Icon) Much like the "Propositions" of the original FFT, these involve sending a unit off alone to complete a quest and then return with the reward. Although, you don't have to go back to collect them in this game.

Free-Area Mission (Flag Icon) These Missions involve sending off a unit to set up a base in another area. Usually you must defeat a specific amount of units in battles before the unit will return and the area is captured. Once you have established an area as your territory, other clans will constantly try to capture it, so make sure you stop them.

Encounter Mission (Tribe Icon) Uncommon quest, these involve an encounter with a rival Clan in which you will be given a choice on how you are to act.

Your Clan also has 8 Skill Levels which will develop as you complete more and more quest. These affect your success at Dispatch and Free-Area Missions, with higher levels you will receive rare items, and a lot of Missions require a certain Skill Level to actually even attempt them, the stats are set out like so:

Combat Skill (Sword)
Smithing Skill (Hammer)
Appraise Skill (Magnifying Glass)
Negotiation Skill (Hand-shake)
Magic Skill (Lightning Bolt)
Craft Skill (Pliers)
Collection Skill (Bug Net)
Track Skill (Foot Prints)