Textbooks are materials that are generally designed to be used by students for introductory, intermediate, and advanced courses of study. They generally have a particular structure and specific components.
Textbooks often use a "tree" structure that includes some variation of the following:
Example 1: Book⇒Chapter⇒Section
Example 2: Book⇒Chapter⇒Section⇒Subsection
Example 3: Book⇒Unit⇒Chapter⇒Section⇒Subsection
Other elements of textbook structure include:
Openers are pedagogical elements that come before the main content. Their role is to lead the learner into the content and provide motivation or a preview. For example:
Closers are pedagogical elements that come after the main content. Their role is to help learners review or reinforce their learning. The goal of closers is to help students summarize, review, or practice what they've learned. Example include:
Integrated pedagogical devices are elements incorporated into the main content. For example, each chapter in a mathematics textbook might include:
a biography and accomplishments of a famous mathematician.
a case study that illustrates the concepts by describing a real-world application.
vocabulary words in bold.
illustration of geometric figures.
emphasis (bold) of key words
Attribution
This definition was adopted from the Pub101 Course maintained by the Open Education Network.