Not all of the traits are created equal, unfortunately.

All traits were tested without any mods but Vanilla Traits Expanded and Vanilla Framework Expanded (as it is needed) and in a testing environment.
2 pawns without traits, with full passion and 20 skill were used.
One pawn was given full 20 skill in each tested passion.

All tests were done by shooting normal quality charge lances at granite walls.

: Doesn't work. Would be great if it worked! You can't change the reloading speed in vanilla.

Both pawns shoot their weapon at the same time, and never drifted from one another.

: +1.1 accuracy on max expertise is nothing, it's barely more than a single level of shooting.

Accuracy was not tested, I trust the vanilla stats.

: Incredibly strong, -105% aiming time at max expertise is amazing.

Pawn with aiming shot significantly faster.

All tests were done using bare fists, stone clubs, normal quality steel knifes and monoswords.
I don't 100% know how melee attacks work.

: Doesn't appear to work. Would be a very good increase to a melee pawns damage output!

Both pawns destroyed a granite wall equally fast.


: Doesn't appear to work. The ingame stat of "Armor penetration factor" it affects is capped to 100%. The increase from the "Piercing" expertise is listed, but the final value is still 100%.

A pawn in full cataphract armor was the victim.
Steel knife used by either pawn weren't able to pierce the armor.
Monoswords were both equally likely to pierce the armor.




: Works fine. A 100% boost to floor creation is nice, but I personally don't think any colony will place that much floor for it to be worth an expertise slot. Also outclassed by Building.

Pawns had to place concrete floor on an equally sized area. Pawn with flooring expertise was significantly faster.


: Works fine. An increase to repair success chance is only useful if the pawn has low manipulation and sight, which lowers their repair speed as well. I can see this being very useful. Also outclassed by Building.

Both pawns were instructed to repair a plasteel wall back to full health. Pawn with expertise significantly faster.

Repair success chance was not tested, simply assumed to work off the stats screen.


: Construct Quality bonus doesn't appear to work. Construct Success chance only matters if pawn has low sight and manipulation. Amazing if it worked, awful in its current state.

Pawns were instructed to construct 18 wooden stools. Pawn without Architecture appeared to make better stools.


: Works as expected. Since construction speed also multiplies repair and flooring speed, a pawn with maxed Building floors and repairs equally as fast as pawns with those respective expertises, which makes them kinda pointless. Pick this always.

Pawns were instructed to repair a plasteel wall, construct a granite double bed, and floor fine granite floor. Pawn with expertise significantly faster.

Other pawn was given both Repair and Flooring expertises. Both pawns floored and repaired equally fast.





: Works. Quite useful if you focus on deep drilling!

Both pawns were assigned to a drill. Pawn with expertise significantly faster.


: Works. Mining Yield is however capped to 125%. A 15 mining pawn would have 107% already, only granting a further 18%. With the vanilla cap as is not very useful.

Pawns were tasked to mine steel. Pawn with expertise produced 50 steel per tile, normal pawn only 45.


: Works. Grants +105% mining speed, which is outclassed by the mining drill arm, which grants 160%, a pawn can have two, and it doesn't take an expertise slot. Not very good.

Pawns were tasked to mine plasteel. Pawn with expertise significantly faster.


: Does not work. Stat appears to be capped to 100%. Why would you want this anyway, deep drills are better for gaining chunks, as deep drills are unlimited.

Pawns were tasked to mine marble. Both pawns produced equal amounts of chunks.




: Works. The speed is useful, if you have a lot of things to butcher, though usually the transporting is the bigger time sink. Butchery Efficiency is unfortunately capped at 150%, reachable with high manipulation.

Pawns were given 3 dead bears to butcher. Pawn with expertise significantly faster, and produced a bit more meat and leather.


: Works. If you want to make a lot of beer, psychite tea or smokeleaf joints, it's good.

Pawns were tasked to make psychite tea at a stove, and smokeleaf joints at a drug lab. Pawn with expertise significantly faster.


: Probably works. Max level completely removes chance of food poisoning, which is rather cool.

I am not testing this, I am believing the stats page.


: Probably works. Cooking speed is capped at 160%, which is reachable with 20 cooking skill, or a small amount of manipulation bonus. However, the expertise only grants a small increase of 1.1, compared to the vanilla 1 per cooking level, which is not very good, even if it was useful.

Pawns produced equally fast at skill level 20. Pawn with expertise produced slightly faster at skill lvl 0 (a very improbable event).



: Works. Produces a bit more food during travel. I cannot judge how good this is, but it's a noticable improvement.

Pawns were moved off-site. Overworld map showed caravan with expertise pawn produced more forage.


: Works. A must pick if you want to use Dryads.

Pawns were bonded to a gauralean tree, and told to prune. Pawn with Pruning significantly faster.


: Works. Unfortunately, harvesting yield is capped at 150%, which is reachable in vanilla.

Pawns were tasked to harvest corn. Pawn with expertise harvested slightly more corn.


: Works. Probably the best and most useful expertise for Planting.

Pawns were tasked to sow a field of potatoes. Pawn with expertise significantly faster.
Plants were grown, and then tasked to harvest. Pawn with expertise once more much faster.




: Tame Chance works, Attack on Tame chance does not. Doubling the taming chance is pretty good! If the attack on Tame chance reduction worked, it would be even better.

Both Pawns were tasked to tame an emu. Both failed, but the tame chance message was higher on the expertise pawn. Both emus fought back, even though the expertise pawn had -105% attack on tame chance (or so it claims).


: May or may not work? Very very good if you focus on animals, both yield and speed increase is awesome.

Pawns were given 4 cows to milk. Both produced the same amount of milk? Animal gather yield is uncapped, but I am not sure if it has an effect above 100%.

Testing dificult, I have no clue on how to force a cow to be milkable.


: Works. Hunting Stealth is capped at 90%, which is given by 20/20 Shooting and Animals, made easier with high moving stat. This expertise massively reduces the required stats for max hunting stealth. Probably not actually very useful, since you want a skilled shooter to do it anyway, to speed up the process.

Pawns had their skill levels in animal and shooting skill changed. Massive increase in the stats page for the pawn with expertise.

: Works. A very good stat to have, as it makes training animals much easier and faster.

Pawns were given 3 wolves to tame. Pawn with expertise succeeded every time (listed chance was 100% compared to 63% of other pawn).



: Works. Shredding Yield is vanilla capped to 150%, so you only get a small increase.

Pawns were given 4 mechanoid corpses to shred. Pawn with expertise was faster and produced 20% more materials.

: Works. If you want to make money with clothing, this is probably a must have.

Pawns were given cloth and a tailoring station, and told to make tuques. Pawn with expertise significantly faster.

: Works. If you want to make a lot of weapons, this is very good. But why do you want so many weapons? You can't sell them

Pawns with given steel, and told to make knifes. Pawn with expertise significantly faster.

: Works. Components are always great to have more of.

Pawns were given steel and tasked to make components. Pawn with expertise significantly faster.



: Doesn't appear to work. Would be really good for outfitting the perfect base.

Pawns were given wood and told to make small sculptures. Both produced roughly equal quality sculptures.

: Works. Good if you want to make a lot of art to sell.

Pawns were given wood and told to make small sculptures. Pawns with expertise significantly faster.



: Works. A pawn with this expertise seems to be able to operate anywhere without fail. I am not sure what the usecase is, making a decent hospital is not hard.

Surgery Success chance is a stat usually associated with *furniture*. Why is it on a pawn?

Pawns were tasked repeatedly to install detoxifier lungs with herbal medicine. The victim laid on the ground in a dirty, but well-lit room. Pawn with expertise never failed, pawn without expertise failed 1/3 of the time.

: Works. Excellent if you need to save someone right now.

Pawns were tasked to tend someone without medicine. Pawn with expertise appeared to be faster.

: Maybe Works. Tend Quality is capped at 200%, though it is dificult to reach in vanilla. It is also capped by your medicine used and somewhat random. Not sure how useful it actually is.

Pawns were tasked to tend someone without medicine. Pawn with expertise produced slightly better results.

Pawns were tasked to tend someone with glitterworld medicine. Both pawns produced equally good results.




: Works. Arrest chance caps out at 100% at social 6, making the increase to that stat rather useless. A pawn with 20 social fully suppresses a pawn already, making that stat increase rather small. Recruitment chance is very good though.

Pawns were tasked with recruiting a prisoner. Pawn with expertise was twice as effective.

Pawns were tasked with arresting a pawn. Chance was 100% for both of them (as you get expertise at social 15, you already have 100% arrest chance by then).

Pawns were tasked with suppressing a pawn. Both filled suppression to 100% from 0%. Only useful on pawns with less than 20 social, and on pawns with low suppression.

: Works. Trade price is not easy to increase, and this gives a good increase, though it appears to be capped at 39.5%. If you want to trade, give this to your trader. Peace talks aren't common enough for it to be relevant.

Pawns were told to trade with a caravan. Pawn with expertise bought for slightly cheaper and sold for slightly more.

: Works. I like to have only one ideology, and this very good for that.

Pawns were tasked to convert a prisoner. Pawn with expertise significantly more effective.



: Works. If you make drugs for a living, pick this.

Pawns were told to produce yayo. Pawn with expertise significantly faster.

: Works. Quests with hacking are somewhat common if you are hunting for relics, but I don't think hacking is relevant often enough for this to be very useful.

Pawns were told to hack a space drone. Pawn with expertise significantly faster.


: Works. Unless you don't research, this is pretty much a mustpick.

Pawns were compared in stats. Pawn with expertise had significantly higher stat. I trust the stats on this one.


I have seen others claim many of these stats actually doing something, but I never noticed that in my game or my tests.

It seems that stats that were added don't appear to work, and that stats that are by default not based in percentage don't work either.

The max bonus from each expertise being 105% not 100% is kinda funny.