Paragraph segues become highly possible using the right choice of paragraph transition words. They ensure the smooth transition from the idea discussed in the last to the next paragraph’s ideas. These transition words serve as your writing glue to help your ideas flow freely and logically throughout your essay. It will be totally disastrous for a writer to assume that his readers would know what he knows and pursue his write ups with such a thought. The best approach is to write as if the readers need all the information you possess and that they need some stepping stones to cross the stream of ideas you are presenting to them.
It is important to remember that this is a rough sketch by which to write your essays. If your topic is quite complicated, then you may have infinitely more evidentiary paragraphs than three. Furthermore, you can expand your individual themes, as well. You can write two or three paragraphs in support of "theme 1" (or Body Paragraph One). The most important thing to remember here is consistency. If you have two or three paragraphs in support of one piece of evidence, then you should have the same amount of paragraphs in support of all sequential facts.