Introduction: Generally “introduce” the two cultures. The only sentence that compares or contrasts the cultures should be the thesis statement. The thesis is the last sentence of the introduction.
Thesis mentions both cultures and the emphasis of the evaluation (how the cultures are similar OR different).
Body paragraphs: Whether using subject-by-subject or point-by-point, topic sentences help to guide the reader. Use the topic sentence to connect to the thesis and give the specific focus of the paragraph. For example, in a point-by-point paragraph, mention both cultures and the point of comparison or contrast. For a subject-by-subject, use the topic sentence to show reader which culture will be evaluated.
Describe the similarities or differences and use examples to show why they are significant. A difference in food, for example, could reflect something unique about the culture or a similarity in food could reflect a connection between cultures and their history.