From Charles Ryan:
Q: I was wondering if there are any guidelines people can offer (and hopefully Charles Ryan) for creating new occupations. For example, none of the listed occupations have "concentration" as a skill. Is there some reason for this, or just happenstance? Is there a formula/rule-of-thumb for creating occupations that weighs the value of skills, feats, wealth, and reputation?
A: There's no design reason why Concentration isn't offered by any existing occupation; if you created an occupation that included Concentration, that would be fine.
Balancing occupations is complex. In general, the factors include:
* Age prerequisite.
* Number of permanent skills/skill bonuses (generally 1 or 2).
* Number of skill choices (generally 5 - 10).
* Number of bonus feats (generally 0 or 1).
* Number of feat choices (generally 1 - 4).
* Reputation bonus (generally 0 to +1).
* Wealth bonus (generally +1 to +6).
The number of class skills, bonus feats, and the Wealth bonus are the main factors; they shouldn't all be high. The number of class choices, feat choices, and Reputation are lesser balancing factors, along with age prerequisites.