Spiral approach
Encyclopedia
The spiral
Spiral
In mathematics, a spiral is a curve which emanates from a central point, getting progressively farther away as it revolves around the point.-Spiral or helix:...

 approach
is a technique often used in teaching or textbook
Textbook
A textbook or coursebook is a manual of instruction in any branch of study. Textbooks are produced according to the demands of educational institutions...

s where first the basic facts of a subject are learned, without worrying about details. Then as learning progresses, more and more details are introduced, while at the same time they are related to the basics which are reemphasized many times to help enter them into long-term memory
Long-term memory
Long-term memory is memory in which associations among items are stored, as part of the theory of a dual-store memory model. According to the theory, long term memory differs structurally and functionally from working memory or short-term memory, which ostensibly stores items for only around 20–30...

. This principle is somewhat similar to the inverted pyramid
Inverted pyramid
The inverted pyramid is a metaphor used by journalists and other writers to illustrate the placing of the most important information first within a text...

 method used in writing news stories, and the game 20 questions.

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