The foundation of the keyword system is the player building up a keyword library through interaction with NPCs and the world. The keyword list starts out empty, and as you speak with NPCs they will reveal new keywords to you. If the revealed keyword is only of interest to that NPC, it will go into a local list. You can click on words in the keyword list to navigate through the conversation. If the revealed keyword has importance beyond that particular conversation, it is put into the regional keyword list. These keywords are of interest to most of the NPCs you encounter that region. A third option, which is never required, is to type something in - a nod to Wasteland 1's system. Keywords are also added to the keyword list through perception skill use and environmental description text. For example, if you use perception to examine an object in the world, your observations might reveal a new keyword.