This document discusses organizing ideas into paragraphs. A paragraph contains a single main idea stated in a topic sentence, usually at the beginning, followed by supporting sentences. When brainstorming ideas, it is helpful to group related ideas together under common topics to organize them. Examples show lists of items grouped by transportation method, subject area, and food/beverage type. An effective topic sentence limits the scope of the paragraph to a single idea. Supporting sentences then provide explanation and details about the main point.