The story
The Zagat Survey was established by Tim and Nina Zagat in 1979 as a way to collect and correlate the ratings of restaurants by diners. Their first guide covered New York City dining, and was accomplished on the basis of a survey of their friends. By 2005, the Zagat Survey included 70 cities, with reviews based on the input of 250,000 individuals. The Guides, over the years, have reported on and rated restaurants, hotels, nightlife, shopping, zoos, music, movies, theaters, golf courses, and airlines. Zagat guide ratings are on a five-point scale, 5 being the highest and 1 is the lowest, with component ratings for defined areas, e.g., for restaurants, including food, decor, and service (with cost also being estimated). In addition to numeric scores, the survey also includes a short descriptive paragraph that incorporates selected quotations (typically a few words) from several reviewers' comments about each restaurant or service, as well as the pricing and rating information.
In 1999, Tim and Nina Zagat's son, Ted Zagat, joined Zagat and served as president and COO until 2007.
Zagat's distinctive thirty-point rankings were replaced with a five-point scale for products not at the Zagat website, following acquisition by Google in September 2011. In March 2018, Zagat was sold by Google to The Infatuation, a restaurant rating app.
From Wikipedia’s article on Zagat, shared under CC BY-SA 4.0.4