http://www.fo2238.fodev.net/wiki/ReputationWiki is really awesome. I insist !
Those actions can influence your reputation, increasing it for some factions and decreasing it for others. * Hurting or killing a critter (See below). It won't raise your reputation above 200. * Joining an NPC-driven faction (NPC-Driven : Vault City citizen, Navarro, Raiders...). * Joining the Slavers. * Selling items at traders. * Waiting. If your reputation with a faction is below -200, you gain +10 in this reputation each real-life day (But it won't go above -200 that way).
* Waiting. If your reputation with a faction is below -200, you gain +10 in this reputation each real-life day (But it won't go above -200 that way).