This lesson focuses on helping students develop a strategy for combining various ideas into well formed sentences which then combine to produce effective descriptive paragraphs.
As I followed Daryl's bookmark (Thanks, Daryl!) to this site, I found this page offering help for people who are having trouble getting the hang of what to include and what to leave out when they write a paragraph. This material (notice the exercises) may also help when students are considering whether or not to begin a new paragraph (in essay writing) or to continue without a paragraph break.