If you can write a good paragraph, you should be able to write a good essay (composition). The difference is that the essay requires(требует) more material and more planning. The principles of unity and coherence are basically the same.
|A paragraph has |An essay has |
|A topic sentence |An essay sentence |
|A controlling idea |A (essay) thesis statement |
|Every sentence supports the topic sentence and the controlling idea |Every paragraph supports the essay sentence and the essay statement |
|Basic materials of a paragraph development are details, reasons, and |Basic materials of an essay development are paragraphs of details, |
|illustrations |reasons, and illustrations |
|Sentences are composed and arranged in a plan of major and minor |Paragraphs are composed and arranged in a plan of major and minor |
|supports |supports |
|Sentences are linked together with appropriate means of coherence |Paragraphs are arranged and linked together with appropriate means of |
| |coherence |
Most academic writing is longer than one paragraph. In fact, paragraphs are usually building blocks(строительнные блоки) for essays. An essay is a group of paragraphs about one topic. Like a good paragraph, a good essay is unified and coherent.