To develop a paragraph by contrast we have to show how two subjects differ from each other. That is, a contrast paragraph’ compares the dissimilar features or qualities that two subjects have. And the topic sentence in such a paragraph indicates how we are comparing the contrasting aspects of two subjects.
This type of paragraph permits two different procedures to be developed:
(a) In a procedure, the dissimilar respects of two subject are compared point by point, that is, one of one subject and one of the other, again one of one subject and one of the other, and so on.
(b) In the second procedure, the comparison of the dissimilar aspects is made subject wise. That is, the aspects related to the first subject are dealt with first, and then the aspects of the second subject.