The types of transitions available to you are as diverse as the circumstances in which you need to use them. A transition can be a single word, a phrase, a sentence, or an entire paragraph. In each case, it functions the same way: first, the transition either directly summarizes the content of a preceding sentence, paragraph, or section or implies such a summary (by reminding the reader of what has come before). Then it helps the reader anticipate or comprehend the new information that you wish to present.
Transitions between sections—Particularly in longer works, it may be necessary to include transitional paragraphs that summarize for the reader the information just covered and specify the relevance of this information to the discussion in the following section.
Transitions between paragraphs—If you have done a good job of arranging paragraphs so that the content of one leads logically to the next, the transition will highlight a relationship that already exists by summarizing the previous paragraph and suggesting something of the content of the paragraph that follows. A transition between paragraphs can be a word or two (however, for example, similarly), a phrase, or a sentence. Transitions can be at the end of the first paragraph, at the beginning of the second paragraph, or in both places.
Transitions within paragraphs—As with transitions between sections and paragraphs, transitions within paragraphs act as cues by helping readers to anticipate what is coming before they read it. Within paragraphs, transitions tend to be single words or short phrases.
"Transitions." The Writing Center. The University of North Carolina at Chapel Hill,
2007. Web. 27 June 2010.