Game concept
Study the Art of Scheming Decision
From the game's encyclopedia
A Decision allowing you to improve your Hostile Schemes. Grants Success Chance and Scheme Phase Length in exchange for Stress.
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.
Study the Art of Scheming Decision is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "A Decision allowing you to improve your Hostile Schemes." It is part of Decision. 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.