To create an outline:

1. Place your thesis statement, topic sentence, or main idea at the beginning.
2. List the major points that support your topic sentence. Label them in Roman Numerals (I, II, III, etc.).
3. List supporting ideas or arguments for each major point. Label them in capital letters (A, B, C, etc.).
4. If needed, continue to sub-divide each supporting idea until your outline is fully developed. Label them 1, 2, 3, etc., and then a, b, c, etc.

Topic: Why radios are an important invention.

I. How radios work

   A. Radio waves

   B. AM and FM waves are different

      1. AM waves

      2. FM waves

II. Radio uses

   A. Two-way radio

      1. Police

      2. Military

      3. Play

   B. Amateur 

      1. Private use

      2. Business use

   C. Broadcasting

     1. Entertainment

     2. News

     3. Advertising 

III. Conclusion