Migration: movement of people into and out of a specified area. Ziva moves to the United States from Israel and her half-brother (before his death) spent some time travelling back and forth between the United States and Israel.

Fertility: incidence of childbearing in a country's population. Director Vance has two children and Gibbs had a child.

Mortality: incidence of death in a country's population. Agent Todd and Director Shepard have both died in the line of duty. Gibbs' first wife and their daughter are also deceased.

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Suburbs: An area beyond the political boundaries of a city. Different cases force the NCIS team to investigate in places like suburbs for clues into a crime.

Migration: The movement of people into and out of a specified territory. Ziva is not originally from the United States, she was from Israel until she migrated.

Gemeinschaff: A type of social organization in which people are closely tied by kinship and tradition. The NCIS team is tied together, as their time together as colleges has helped them develop a sense of kinship between them.

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