A Model Citizen

A Model Citizen is a quest in the Fallout 4 add-on Vault-Tec Workshop.

Detailed walkthrough
After reaching Valery Barstow, she will ask the Sole Survivor to follow her as she explains her situation. There are several feral ghouls nearby who used to be part of the construction team working inside the vault. The nearest one, Julian, will become hostile if one gets too close to him. Barstow will ask him to stop, before realizing he no longer responds, and will request the Sole Survivor to put the rest of the construction team out of their misery. Once all the ghouls are dead, Barstow will explain that Stanislaus Braun tasked her with a vital experiment for Vault 88.

If one chooses the 'Vault-Tec are bastards' option in dialogue, she will understand, and state that the program can be altered to be more ethical to the test subjects (though the player character can alter the parameters of each experiment to be ethical, even if this dialogue option is not chosen). There is also the option to expel Barstow from the vault, permanently failing and ending the questline, but giving the Sole Survivor control of the entire vault and granting access to all of the prototypes. The achievement Oversight may also be gained here.

If one grants her wishes, the Vault 88 overseer's desk must then be built with the workshop for her. Once she has consulted the terminal, she will ask the Sole Survivor to turn on the radio beacon in the entranceway where Security Chief Andersen was encountered. Its switch is on the large control board in the middle of the room. After that is completed, the player character will be told to Explore Vault 88, triggering the related sidequest. This requires clearing rockfalls that have blocked up entrances to new passages beyond the main chamber, as well as restarting the workshops in these sections as well.

Once enough of the vault has been explored (not all sectors are required for this to happen) the next stage is to help Barstow interview new candidates into the vault. A group of settlers will have appeared at the entrance to the Vault, summoned by the radio beacon. Two are unnamed, the third being Clem, who is the type of person Barstow is looking for.