Structures could be examples of forms or screens examples.
Principles provide important policy information.
Concept reminds you to ask if there are any terms or ideas that need to be defined for the audience. Using the hierarchy principle, begin your document with an overview that provides a high level description of the overall process, system or structure of the subject matter. Using the accessible detail, subsequent units can be specific to a different audience, containing only information that pertains to a particular group. The best approach is to create models and standards. A model, which is developed at the very beginning of a project, is a sample portion of the document and can be just a few pages.