Yes, the topic is assigned, yet how it will be presented depends on you.
For example, in the framework of drawing analogy between two books of your choice you are free to select books: Depending on the selected type of comparison, you will build the paper in a particular but consistent way.
Well, actually comparison is quite a structured process with clear steps and strategies.
Compare and contrast essay is a paper that contains this clear and limited comparison of selected objects, concepts, phenomena, etc.
To do this efficiently, employ the so called Venn Diagram.
Venn diagram depicts objects of comparison as two partially overlapping areas.The subject matter and the significant similarities or differences may help determine how to lay out your essay.If you have a difficult time with the structure, try outlining your ideas, and this may help you find the structure that works best for you and your ideas.After evaluating your subjects, you need to write a thesis statement that will go in your essay's introduction.The thesis drives the rest of your essay, so you should consider your subject carefully to help you form this main idea.Writing a compare and contrast essay may look like ‘mission impossible’ because the process of comparison can take hours and even days of hard work.So it is naturally a scary job to undertake a task that has no visible limits.You may need to research your subject before you can accurately evaluate them.Depending on your subject, you may not find many similarities, but you may find at least one element that would classify your subjects in a similar way.Next, look for the differences in the subject matter. Depending on the specified length of your essay assignment, you may not have the room to include every similarity and difference in your subjects.To help you narrow the focus of your essay, you may want to highlight or circle the most important discoveries and focus on these when you begin sharing the information in the body of your essay.