The best way to analyze a restaurant's competition is

I would say it is the third one down (visit the restaurants in the same trading area) because that is the only one where you gain the knowledge first hand. When you have middle men (people writing online, people who have visited the restaurant themselves, or members of the BBB) there can be a bias as they may claim the competition is better when it is not for personal gain. 

The linear perspective changed the quality of art because it gave art a sense of reality. it gave the illusion that the background and surroundings were actually close and/or far and a sense of depth. linear perspective change the quality of art following its birth the renaissance period as they want the art to be more realistic and they believe one way to achieve it is to use the method of linear perspective. it uses the principle of math to realistically portray space and depth in art.