Note to Players: Information here is considered metagaming. Your character should not reference or use these numbers in game to determine who should roll for specific skills.
Book 2, page 22, "This Skill is the weapon-producing counterpart of Armorer Skill. The prerequisite Skill will depend on the type of weapon to be made. The Task Value of a weapon is its basic WDM times its Survival Value and the basic Task Period is a day. "
"The character’s score in Weaponsmithing Skill is averaged with his score in the Skill covering the material being worked on to determine the character's BCS for performing the Task. "