Classification can explain things clearly. Classification is an important way to clarify complex things. The characteristics and essence of some things need to be divided into several points or aspects, which also belongs to classification. Classification can divide things into several categories according to the similarities and differences of shapes, properties, components, functions and other attributes, and then pay attention to explaining them according to categories.

standard of classification

Pay attention to the classification standards when using classification methods. A classification can only use the same standard to avoid overlapping.

Classification method

For example: "The collection of books in the library includes China, classics, foreign countries, science and technology, literature, modern times and political economy." There is more than one standard used here, so it is not clear. The correct statement should be: according to the country, there are two kinds of books in the library; According to the times, there are classical and modern; By nature, there are science and technology, literature and political economy.

Clear classification

Only one standard is used for each classification, and the eyes are clear.