The only correct principle for classification of predictions is not to make any exclusions, but to strictly distinguish the boundary conditions of each case. Any classification, in fact, is equivalent to a piecewise function, is to determine the number of boundary conditions of this piecewise function clearly. After the boundary conditions are segmented, it is necessary to determine how to operate once any situation occurs, that is, the operation is also segmented. Then, leave all the circumstances to the market itself, and let the market choose for itself. ——Chang's theory·prediction about the future（Lesson 68）
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The basis of all predictions is categorization, the complete categorization of all possible scenarios. It may be said that after classification and the exclusion of the impossible, the final result is accurate. This is the rusty idea that any exclusion is equivalent to a prediction, and every exclusion of a classification makes the final so-called precision become less accurate, and finally there is no escape from the probability. ——Chang's theory·prediction about the future（Lesson 68）
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Chang's theory is a classic investment theory from China. It is an investment methodology, and it is a method to analyze and understand the market created by teacher Chang, including a series of knowledge and technical theories such as morphology and dynamics (trend, level, pen, line segment, center, and backflight), and fund management.
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