Hello, I'm the spokesman from the brazilian community Elite Dangerous Brasil and I've come here to talk about Powerplay, most specifically about the Undermining system.
First, I would like to confirm the knowledge we gattered about the mechanic after watching the Powerplay Tutorials, after reading the Beta Manual and the Powerplay Manual:
EXPANSION SYSTEM:
1- If only the Expansion Trigger is achieved, the Expansion will occur.
2- If only the Opposition Trigger is achieved, the expansion will fail.
3- If both the Expansion Trigger and the Opposition Trigger are achieved, the Expansion will only occur if the Expansion Total is higher than Opposition Total.
(This means it is worth to keep doing Expansion/Undermining missions even after it reaches 100%)
CONTROL SYSTEM:
1- If only the Fortify Trigger is achieved, the system will be fortified and the cost reduced.
2- If only the Opposition Trigger is achieved, the system will be undermined and its cost will increase.
3- If both the Fortify Trigger and Opposition Trigger are achieved, they will cancel eachother and the cost of the system will be it's default cost.
(This means there is no reason to keep doing Fortify/Undermining missions after it reaches 100% )
Something that was never explained is the change of the Icon in the SYSTEM ALERTS inside the CONTROL TAB:

I've noticed that the symbol changes depending on the Undermining Total and the Fortify Total but it was never explained what the symbol change means. Reading the state of various Powers I can confirm that:
1-If the Opposition Total is higher than the Fortify Total it will display the Crosshair Symbol.
2-If the Fortify Total is higher than the Opposition Total it will display the Shield Symbol.
3-In the graphics on the PROGRESS if Fortify is higher than the Opposition, does not mean it will display the Shield Symbol:

PS: In the official video Powerplay Training Part 3: Expansion , at 3:00 when it starts to talk about Undermining Expansion of another Power, it displays the CONTROL TAB and not the EXPANSION TAB. (Since they work differently, this makes people confused).
Link: https://www.youtube.com/watch?v=ugdhzV_nefQ
Many thanks,
Elite Dangerous Brasil
First, I would like to confirm the knowledge we gattered about the mechanic after watching the Powerplay Tutorials, after reading the Beta Manual and the Powerplay Manual:
EXPANSION SYSTEM:
1- If only the Expansion Trigger is achieved, the Expansion will occur.
2- If only the Opposition Trigger is achieved, the expansion will fail.
3- If both the Expansion Trigger and the Opposition Trigger are achieved, the Expansion will only occur if the Expansion Total is higher than Opposition Total.
(This means it is worth to keep doing Expansion/Undermining missions even after it reaches 100%)
CONTROL SYSTEM:
1- If only the Fortify Trigger is achieved, the system will be fortified and the cost reduced.
2- If only the Opposition Trigger is achieved, the system will be undermined and its cost will increase.
3- If both the Fortify Trigger and Opposition Trigger are achieved, they will cancel eachother and the cost of the system will be it's default cost.
(This means there is no reason to keep doing Fortify/Undermining missions after it reaches 100% )
Something that was never explained is the change of the Icon in the SYSTEM ALERTS inside the CONTROL TAB:

I've noticed that the symbol changes depending on the Undermining Total and the Fortify Total but it was never explained what the symbol change means. Reading the state of various Powers I can confirm that:
1-If the Opposition Total is higher than the Fortify Total it will display the Crosshair Symbol.
2-If the Fortify Total is higher than the Opposition Total it will display the Shield Symbol.
3-In the graphics on the PROGRESS if Fortify is higher than the Opposition, does not mean it will display the Shield Symbol:

PS: In the official video Powerplay Training Part 3: Expansion , at 3:00 when it starts to talk about Undermining Expansion of another Power, it displays the CONTROL TAB and not the EXPANSION TAB. (Since they work differently, this makes people confused).
Link: https://www.youtube.com/watch?v=ugdhzV_nefQ
Many thanks,
Elite Dangerous Brasil