At Bridge Ratings, our product technology consists of a call-center providing phone interviews, which are conducted Monday through Friday, 10 am to 9 pm, and weekends, Noon to 9 pm (local times).

Geographic survey areas are determined by ZIP Code counts for the market's metropolitan area as defined by the United States Census, the United States Postal Service and conforming to Arbitron geographics to assure comparable radio audience samples.

The percentage of needed in-tab (useable) interviews from each ZIP Code is then determined, corresponding to the percentage of the population (12+ universe) within the geographical boundaries of that ZIP Code.

The demographic counts available for each state, county, city and ZIP Code are used in the determination of the population and demographics of the survey area.

An unduplicated random sample of telephone numbers is computer generated based on the ZIP Code directives, assuring randomness among the sample. This random method of determining sample households ensures that unlisted numbers and newly issued, non-published households will be reached as well as normally listed number for a full universe of potential households.