How does Does diminishing returns work in relation to Superior and less superior modules of the same type? i need the exact math. according to AI if i have 1 faction module and 2 t1 modules the faction module will have 100% effectiveness while the T1s will incur diminishing returns (87%,57% etc.) I have searched in game and online and also done math but came up with mixed results.
which modules are you exactly trying to use
this may be what you are looking for. Stacking Penalties
doesn’t matter if its T1, T2, Faction etc.. the meta of the module itself is not considered in the equation. If you Fit a T1, then a T2, the T2 is gonna be less effective than the T1.., well if the T1 has a stronger bonus than the T2..
Maybe click the links your AI answer provides to read the source.
And if the AI answer doesn’t provide a source, I wouldn’t use that AI to answer EVE questions.
The wiki above has the answer:
1st mod: 100.0% effectiveness
2nd mod: ~86.9% effectiveness
3rd mod: ~57.1% effectiveness
4th mod: ~28.3% effectiveness
5th mod: ~10.6% effectiveness
6th mod: ~3.0% effectiveness
And the order of the mods depends on the strength of their effect. So, if you have three mods with this effect of which one faction with a stronger bonus, the strongest bonus from a faction bonus would be considered the ‘first mod’ at 100% efectiveness when you also have two weaker T1 mods which then are considered to be mod nr 2 and 3 at respectively 86.9% and 57.1% effectiveness.
If your math is off, care to share it? We might be able to tell wha’s going on.
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I just fiddle with the ship in the simulator first before making any purchase. Swapping parts don’t cost you anything and shows you the immediate results. Here is an example of a typical fit I use for the miasmos ore hauler.
I need get up and go from this ship. Quick into warp means you are safe until the next jump. The default Align Time is 13.22 seconds, but the server rounds all fractions up no matter how small, this is really 14 seconds.
Adding this Inertial Stabilizer reduced the time to 11 seconds.
Adding the second one reduces it to 9 seconds and the third down to 8 seconds.
However adding a 4th is a waste, it is hanging on 8 seconds.
I can also reduce the cost by dropping it back to 2 tier II and placing a cheaper tier I keeping it at 8 seconds alignment time.
Mine Safe 
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the last paragraph, what is your source for that information?
thats what i thought as well becuase thats what AI said but idk if that is right. i was hoping the faction would be at 100% as well but im not sure bcuse when i did the math it came up short.
Says it in the link provided that the type of module is not factored into the math.
Type of module may not be factored into the math, but the strength of the effect is what is used to determine the order, as far as I know.
So the strongest module has least diminishing returns.
This usually is the highest tier item, but not always so, because it can happen lower tier different items can give stronger effects. For example if you have a cheap T1 EM shield hardener (50% EM shield resist) and a very expensive Pithum A-type Multispectrum Shield hardener (46.9% shield resistances for EM, Kinetic, Explosive and Thermal) the diminishing returns for EM resist alone see the T1 EM shield hardener as ‘highest resist’ so there the T1 shield hardener is considered the ‘strongest’ effect with least diminishing returns. For EM only.
And unless you have other shield resistance modules, the other resistances of the Pithum A-type hardener won’t be diminished and will be 46.9% for the other three, and diminishing returns only reduces the EM resistance of that module.
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still need definitive proof
Please give an example of mod values you see and mod values you get.
Show us your math and why you think it is wrong and I can check if and where it is wrong.
Or read: https://support.eveonline.com/hc/en-us/articles/203280381-Bonuses-and-Stacking-Penalties
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beautiful Gerard Amatin. that was just what i was looking for.
3rd party sites that uses that same information, you wanted it straight from the source. Dick
Nice to hear that’s what you were looking for.
Personally I’m more convinced by numbers instead of documentation if I really proof about game mechanics, as documentation in games isn’t always accurate.
But just know that data on the EVE uni wiki that was linked earlier is mostly accurate and not worse than the data on the EVE website. In fact I wouldn’t be surprised if that last page I linked was written based on the EVE uni wiki page.