The comparison/contrast essay is one of the most neglected essay types in high school, probably because many teachers are uncomfortable teaching how to write a compare and contrast essay without confusing their students. This is really not a difficult essay to write, however, if the following steps are followed:
Once your body paragraphs are completed, you are ready to write your compare and contrast essay introduction. You should of course open with an attention-grabbing fact or anecdote, just as you would in any other essay. An example might be this: Of all of the developed nations in the world, the United States is the only country that continues to describe its economic system as capitalistic.
The compare and contrast essay requires very specific organizational structure if it is to be coherent and logical. Carefully using either of the two formats should give you that coherency.