upgrade the ability of this skill check

By Kratch, in Game Mechanics

There are a few examples of this wording (thread title) used in various talents or upgrades. The two specific examples I've found are on the Optical Camouflage armour attachment, and the Intense Focus talent (of less importance to me, but another example anyways).

I've been unable to figure out what this means in relation to the game mechanics... Does this mean turning green dice into yellow... what if you have no green dice? Alternatively, does it mean increasing the base attribute (agility for stealth), but that doesn't seem right ether, as the attributes aren't called abilities, they're called characteristics?

I just can't seem to figure out how this mechanic works. I'd appreciate any feedback.

Kratch