How are informal outlines often organized?

Informal outlines are typically organized using a hierarchical structure that prioritizes main ideas and supporting details. They may use bullet points or numbered lists to represent different levels of information, with broader concepts at the top and more specific points beneath. This structure allows for flexibility and easy adjustments, making it useful for brainstorming and grouping related ideas. Overall, informal outlines serve as a visual guide to organize thoughts before developing more formal content.