this is from wikipedia .
Other notable series by Bethesda Softworks include The Elder Scrolls, the series of which Oblivion is the 9th title and the 4th main title. Fallout 3 and New Vegas are based on the same engine as Oblivion. so this would mean that the game is a Bethesda game they own the franchise and have since 07 .
i dont care what group they hired to write the plot and insert there ideas , in order to get back to the roots of the original storyline . So again , Good Job Bethesda!
Bethesda Softworks contracted Obsidian to make a Fallout game using the engine and assets Bethesda Game Studios made for Fallout 3. Obsidian still had full raign over engine tweaks they wanted to do, but they had to keep the game similar in style to Fallout 3.
Bethesda Softworks == Publisher
Bethesda Game Studios == Developer of the Elder Scrolls series and Fallout 3
Obsidian == Developer of Fallout New Vegas
If you try to refute this then you are a [censored] idiot.