'The star symbols judge only what’s on the plate, meaning the quality of products, the mastering of flavors, mastering of cooking, personality of the cuisine, value for the money and the consistency of what the restaurant offers to its customers both throughout the menu and the year.
Along with the rating of stars, the MICHELIN Guide provides a written description of each locale with a variety of symbols to give further insight into an establishment. Ambiance, specialties, and wine are just a few of the factors. Comfort is also rated by 1 to 5 forks and spoons for a restaurant and 1 to 5 pavilions for a hotel.'
http://www.michelintravel.com/michelin-selections/selecting-our-stars/