In what situations are compare-and-contrast essays effective? When would that style be ineffective? What is the difference?

In what situations are compare-and-contrast essays effective? When would that style be ineffective? What is the difference? There are two basic organizational methods for a compare-and-contrast essay. Do you think one is a stronger method, or are they situational? Review Ch. 10, Section 9.3, of Writing for Success. Everyone has biases. Biases are not always negative; they can help you construct a strong argument. How can a bias negatively affect your essay? What can you do to prevent this?