'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.
One star indicates a very good restaurant in its category, offering cuisine prepared to a consistently high standard. A good place to stop on your journey.
Two stars denote excellent cuisine, skillfully and carefully crafted dishes of outstanding quality. Worth a detour.
Three stars reward exceptional cuisine where diners eat extremely well, often superbly. Distinctive dishes are precisely executed, using superlative ingredients. Worth a special journey.
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/