the Jester said:
My solution-of-choice is simply to give each pc a background and say, "When you make an ability check and you think your background ought to apply, check with your dm. If he agrees, you get advantage/a flat bonus/to add your skill die/etc". Instead of a specific skill check, I'd rather see a simpler "my background trained me for this" mechanic adjudicated by the dm.
I've also used this in one-off games, particularly rules light or no-rules games. But I consider it unsuitable for campaign use - it allows no character growth in-game.
My RPG uses the Profession skill, but you have to specialize. Depending on your level, it improves in depth or breath. Essentially, at level 0-3, you might be a bladesmith or infantry, but at level 3, you get your choice: either +1 to that profession (depth), or increase your trade by one step, so a bladesmith might become a blacksmith and infantry might become a mercenary or soldier. At levels 7, 11, and 15, you get another +1 or +1 step.
So, say you have Profession (Forester). At level 3, you make this Profession (Forester: +1), giving yourself a +1 on appropriate rolls (as determined by the GM). At level 7, you make this Profession (Ranger: +1), since you choose to bump it one step. At level 11, it's Profession (Ranger: +2), and finally Profession (Head Ranger: +2) at level 15.
If you only boosted its depth, it might look like this:
Level 0: Profession (Forester)
Level 3: Profession (Ranger)
Level 7: Profession (Head Ranger)
Level 11 (branches to Tier 2 Profession related to primary Profession): Profession (Head Ranger / Bandit)
Level 15 (increase secondary Profession to Tier 3): Profession (Head Ranger / Bandit Leader)
Now, if you want to avoid the branching (too complex for some), just make it "advance breadth (max Tier 3), or add depth of +1 (no limit)." Simple simple.
However, I use this in a system that still has Hide, Move Silently, etc. in it. So, if I want to, I can pick up Profession (Thief), and I'll get to use Hide and Move Silently in many situations. If, however, I want it in all situations for all uses and at all times, I invest in Hide and Move Silently (which allow for things like sniping, fading into the background in a crowd, muffling the sound of your blow, etc.). Hide and Move Silently are big investments, but guarantee you can use all uses of them at all times. However, Profession (Thief) will give you moving silently and hiding from people, probably some ability to pick locks, some ability to pickpocket, etc.
At any rate, my point is even if you go with just a Profession system, if you go the depth / breadth route, you can definitely have character growth. As always, play what you like
