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The last chapter discussed the importance of using good grammar and good word
choice in your writing. However, the most grammatically perfect paragraph will
not receive a good grade if it is poorly organized and not focused on a central
idea. The paragraph must have unity and coherence. These ideas were discussed
briefly in chapter 22, but in this chapter we will explore unity and coherence
more fully so that you can learn how these elements impact your writing.

As you learned in Chapter 22, coherence is whether or not what you write
makes sense and whether or not the ideas are arranged in a logical manner. If
ideas are out of order in writing, then the reader has a very difficult time
trying to understand your point. As a result the reader will lose interest and
you will not be able to convey your point.

Unity is equally important. Unity means that your writing sticks to one point
at a time. When you mix and match ideas in writing jumping from one idea to the
next and back again, the reader has a hard time following you. Inevitably, the
reader will not understand your point and will eventually lose interest. This
chapter explores ways to help you make certain that your writing is both
coherent and unified.