3e SRD:Profession Skill
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Profession (Wis; Trained Only)
The character is trained in a livelihood or a professional role, such as apothecary, boater, bookkeeper, brewer, cook, driver, farmer, fisher, guide, herbalist, herdsman, innkeeper, lumberjack, miller, miner, porter, rancher, sailor, scribe, siege engineer, stablehand, tanner, teamster, woodcutter, and so forth.
Like Craft, Profession is actually a number of separate skills. The character could have several Profession skills, each with its own ranks, each purchased as a separate skill.
While a Craft skill represents skill in creating or making an item, a Profession skill represents an aptitude in a vocation requiring a broader range of less specific knowledge. To draw a modern analogy, if an occupation is a service industry, it's probably a Profession skill. If it's in the manufacturing sector, it's probably a Craft skill.
The character can practice a trade and make a decent living, earning about half the check result in gold pieces per week of dedicated work. The character knows how to use the tools of the trade, how to perform the profession's daily tasks, how to supervise untrained helpers, and how to handle common problems. For example, a sailor knows how to tie several basic knots, how to tend and repair sails, and how to stand a deck watch at sea. The DM sets DCs for specialized tasks.
An attempt to use a Profession skill to earn an income cannot be retried. The character is stuck with whatever weekly wage the check result brought the character. (Another check may be made after a week to determine a new income for the next period of time.) An attempt to accomplish some specific task can usually be retried.
Untrained laborers and assistants earn an average of 1 silver piece per day.