It can help to help make a match up between your some ideas and produce subtopics that may be progressed into subject sentences. So that you can draw a map, you need to draw sectors. The main group should support the main proven fact that will likely to be progressed into a thesis statement down the road. Then, you need to draw other groups that comprise of sub-ideas that produce the subject sentences for the paragraphs that are developmental.
example perhaps perhaps maybe not noticeable in this excerpt
Figure 1.1. Clustering (Adopted from: Robitaille & Connelly, 2007, p. 40)