Here you explain in concrete terms what you mean by your lofty claims and show them in action. Eventually, you make your way back up again so that readers can see the examples in their context, that is, what they mean to the bigger picture. If, on the other hand, your valleys mutate into vast prairies, readers begin to lose a sense of the original general assertions. Or, if your peaks become heady plateaus, the audience will get dizzy from the high altitude and long for examples in the concrete world. Therefore, you must always achieve a sense of balance between the general and the particular.
Unity is the development of a single controlling idea usually presented in the topic sentence.
Each sentence should somehow develop that idea and no other. Thus, if you're typing a sentence in your draft that doesn't seem to fit where it is, keep it in but flag it somehow. During revision , you'll see whether there isn't a better spot for it or if it ought to be scrapped. Coherence is a quality where the writer makes it explicitly clear what the connections are between thoughts. Use pronouns for important nouns .