How can we determine the quality of something? We can do it only by examining or testing it. For example, if you want to judge the quality of a piece of paper, you might look at its color, feel its texture, measure its dimensions and see how easily it tears. If you wanted to evaluate an automobile you might consider how many kilometers it can go per liter of fuel, how many people can ride in it, how much luggage it can carry, how comfortable the ride is and whether it is capable of going up hills without slowing down.