Star Wars: The Old Republic (SWTOR) is about shooting, crafting, credits, and money. However, BioWare's new MMORPG requires a somewhat different view towards the standard Massively-Multiplayer Online RPG crafting system. As opposed to simply giving the gamer character a set of skills to grind in order to make Great Item XYZ and sell it for SWTOR Credits, players assign the members with their ship's computer-controlled crew to several tasks they are specially suited towards, with all the important exception being the actual crafting skills. They're limited to one skill for the whole crew. Even though this allows the gamer character to work on skills and earn SWTOR Credits even while they are playing the right game, the general gain on SWTOR Credits is somewhat minimized with that.
There are four currently-known crafting skills, causing all of them are essential for high-level play. Armormech is necessary to create armor, Artifice is mandatory to produce Force Artifacts usable by Jedi and Sith, Biochem could be the traditional "alchemist" class, always essential for the best buffs and also the most SWTOR Credits, and Armstech crafts weapons for your player to make use of. Any MMORPG player knows most of these are mandatory in almost any endgame content. However, there's two additional skills that remain unrevealed at this time. If the gameplay in contemporaries like Rift and World of Warcraft are any indication, all of these will likely be equally required.