Talk to the Overseer is a quest objective in the mission A Model Citizen in Fallout 4: Vault Tec.
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Walkthrough[edit]
Approach and talk with Overseer Barstow. She will make an offer for you to work with her, as partners for the experiments that Vault 88 was meant to carry out. You will be given a Charisma Challenge that will let you ask for money for your part.