Montessori's three-stage teaching method is the most commonly used when demonstrating works with children. The three-stage teaching method was invented by Edouard Seguin, and was widely used by Montessori in her teaching method to let children learn the names and characteristics of things (teaching AIDS).

The first paragraph: introduce the name of the object (what the senses touch). Parents say to their children, "This is _ _ _ _ _." If the child doesn't understand the relationship between "things" and names, repeat this step.

The second paragraph: identify the name of the object (teaching aid). Parents say to their children, "Show me _ _ _" or "Give me _ _ _ _". "The last item introduced in the first step is asked in the second paragraph. After the child has mastered the second stage, he enters the final stage.

The third paragraph: answer the name of the article. Parents ask their children, "What is this?" Similarly, ask the name of the last item in the second stage first.

Three-stage teaching not only increases children's vocabulary, but also understands the characteristics of objects, such as color, shape, size and quantity, and establishes children's logical concepts. Usually, people regard sensory teaching as the predecessor of mathematics. This method is not only used in sensory teaching, but also in other aspects, such as mathematics, Chinese, geography and all aspects of daily life.