Game concept
Contract Scheme
The game also links it as Contract Schemes, Contract Scheme's, Contract Schemes', Contract.
From the game's encyclopedia
Many Contracts require Adventurers to successfully complete a Scheme.
These can be harmful (like murdering a Contractor's Rival), pleasant (like simply telling stories to entertain their Court for a few months), or innocuous (like transcribing texts for them).
If the Scheme is failed or abandoned for any reason, the Contract is failed too.
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.
Contract Scheme is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "Many Contracts require Adventurers to successfully complete a Scheme." It is part of Contract. The game also links it as Contract Schemes, Contract Scheme's, Contract Schemes' and Contract. Patch 1.20.1.2, from game/common/game_concepts/07_ep3_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.
Source: game/common/game_concepts/07_ep3_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.