Game concept
Scheme Potential
The game also links it as Potential.
From the game's encyclopedia
A Scheme has a Success Chance, a percentage value that determines its outcome, reached via Scheme Growth. This is limited by Scheme Potential, which serves as the upper bound of a Scheme.
Scheme Potential can be increased by hiring appropriate Agents, but can never exceed 95%, except for Contract Schemes.
Harmonious Agents may give further bonus Modifiers via events.
Excess Success Chance above a Scheme's Potential is lost.
The game's text for patch 1.20.1.2. Words in blue are entries of the encyclopedia: hover one to read it, as in the game.
Scheme Potential is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "A Scheme has a Success Chance, a percentage value that determines its outcome, reached via Scheme Growth." It is part of Scheme Success Chance. The game also links it as Potential. Patch 1.20.1.2, from game/common/game_concepts/00_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.
Source: game/common/game_concepts/00_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.