Uses of Intellect in interactions

In interactions, a party member's Intellect score is usually checked to unlock dialog options for deduction, sudden realizations, and problem-solving.

Quest dialogs
In quest related dialogs the player's Intellect score may unlock the following options:

[To Do: This table is incomplete. Options: ]
 * 1) Add the missing items manually.
 * 2) Ensure that the individual quest pages have this information, and turn this table into a SMW query that automatically gathers the information from them.

Other dialogs
In dialogs, not related to certain quests, the player's Intellect score may as well unlock additional conversation options:

Scripted interactions
Scripted interactions may also check the Intellect score. Some situations allow to choose which party member will perform the action, sometimes a certain member or the player will be checked.