First, understand and describe the problem stage. The first step is to determine what the problem is, that is, to understand and characterize the problem, that is, to look at the problem from what angle, including the conditions and objectives of the problem. At this stage, we should do a good job in the identification of relevant information, semantic understanding, overall representation and problem classification.

Second, make plans, choose appropriate strategies and seek answers. Making plans or seeking answers refers to determining the general process of solving problems, such as redefining problems to make them more similar to familiar problems; Establish the sub-goal level of the problem; Choose strategies to solve problems, etc. There are two strategies at this stage: algorithm and heuristic.

Third, apply strategies, implement plans and try to solve problems.

Fourth, the stage of evaluation and reflection.