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The stacking penalty applies to the bonus, not to the module.

If you have a thermal hardener and an EM hardener fitted, both would provide the full resist bonus. If you add omni-resist plating, its thermal and EM bonuses would be reduced because of the stacking penalty, but its explosive and kinetic bonuses would not.

The precise formula is somewhat complicated, but it can be summarized as:

1. The first module provides 100% of its bonus.
2. The second provides ~87% of its bonus.
3. The third provides ~57% of its bonus.
4. The fourth provides ~28% of its bonus.
5. The fifth ensures your fit gets posted in a "fail fits" thread on the forums.

The order you fit the modules doesn't matter; the one with the largest bonus will always be considered "first".

Some modules (notably Damage Control Units) are exempt from stacking penalties.

The stacking penalty applies to the bonus, not to the module.

If you have a thermal hardener and an EM hardener fitted, both would provide the full resist bonus. If you add omni-resist plating, its thermal and EM bonuses would be reduced because of the stacking penalty, but its explosive and kinetic bonuses would not.

The precise formula is somewhat complicated, but it can be summarized as:

1. The first module provides 100% of its bonus.
2. The second provides ~87% of its bonus.
3. The third provides ~57% of its bonus.
4. The fourth provides ~28% of its bonus.
5. The fifth ensures your fit gets posted in a "fail fits" thread on the forums.

The order you fit the modules doesn't matter; the one with the largest bonus will always be considered "first".

Some modules (notably Damage Control Units) are exempt from stacking penalties.

The stacking penalty applies for each stat that is being modified. For example, a thermal hardener would not be affected if you also fit a kinetic hardener, but it would be affected if you fit thermal plating, or omni-resist plating.

The precise formula is somewhat complicated, but it can be summarized as:

1. The first module provides 100% of its bonus.
2. The second provides ~87% of its bonus.
3. The third provides ~57% of its bonus.
4. The fourth provides ~28% of its bonus.
5. The fifth ensures your fit gets posted in a "fail fits" thread on the forums.

The order you fit the modules doesn't matter; the one with the largest bonus will always be considered "first".

Some modules (notably Damage Control Units) are exempt from stacking penalties.

The stacking penalty applies to the bonus, not to the module.

If you have a thermal hardener and an EM hardener fitted, both would provide the full resist bonus. If you add omni-resist plating, its thermal and EM bonuses would be reduced because of the stacking penalty, but its explosive and kinetic bonuses would not.

The precise formula is somewhat complicated, but it can be summarized as:

1. The first module provides 100% of its bonus.
2. The second provides ~87% of its bonus.
3. The third provides ~57% of its bonus.
4. The fourth provides ~28% of its bonus.
5. The fifth ensures your fit gets posted in a "fail fits" thread on the forums.

The order you fit the modules doesn't matter; the one with the largest bonus will always be considered "first".

Some modules (notably Damage Control Units) are exempt from stacking penalties.

For modules that boost your resistance, diminishing returns apply to each module that affects the same resistance stat. A thermal hardener is not affected by a kinetic hardener, but it would be affected by thermal plating.

See this answer at Skill Training Complete for more info.

The stacking penalty applies for each stat that is being modified. For example, a thermal hardener would not be affected if you also fit a kinetic hardener, but it would be affected if you fit thermal plating, or omni-resist plating.

The precise formula is somewhat complicated, but it can be summarized as:

1. The first module provides 100% of its bonus.
2. The second provides ~87% of its bonus.
3. The third provides ~57% of its bonus.
4. The fourth provides ~28% of its bonus.
5. The fifth ensures your fit gets posted in a "fail fits" thread on the forums.

The order you fit the modules doesn't matter; the one with the largest bonus will always be considered "first".

Some modules (notably Damage Control Units) are exempt from stacking penalties.