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Network Glossary


An office for gathering or distributing news. Similar terms are used for specialized bureaus, often to indicate geographic location or scope of coverage: a Tokyo bureau refers to a given news operation’s office in Tokyo. Foreign bureau is a generic term for a news office set up in a country other than the primary operations center. A Washington bureau is an office in the capital that covers news related to national politics and government in the United States.

Prime time

The hours on weekdays between 8 p.m. and 11 p.m., in which the average audience is measured by Nielsen. On Sundays, the prime-time hours are 7 p.m. to 11 p.m.


A percentage measure of total households or population owning TVs who are tuned to a particular program or station at a specific time (e.g., a six rating for women 18-49 means 6 percent of all women 18-49 in the defined geographic area were viewing that station or program), according to the Television Advertising Bureau.


The Television Advertising Bureau defines share as the percent of households (household share) or persons (P2+ share) using television who are tuned to a specific program, network or station at a specific time.


Collectively, the viewers of a television program.


Staffing Changes

These are not all of the staff changes at the networks, but compiled to the best of our abilities.

ABC News

Behind the Scenes:
On Air:

CBS News

Behind the Scenes:
On Air:

NBC News

Behind the Scenes:
On the Air:

PBS News