Through Communications Course is an entry-level Scientology course, and is many people's first introduction to the cult's practices. It appears at the bottom of the big chart of The Bridge on display in every Scientology org.
Many pages contain a single large cartoon illustration.
Illustration of TR4 from Hubbard Qualified Scientologist Course , by L. Ron Hubbard, p. 155. She must persist in this manner until the preclear has answered the question. This is discussed further in Perry Scott's critique and Dick Sutphen's essay as cited on the main TR page.