① Select retrieval tools according to the research topic;

(2) determine the retrieval method;

(3) refer to the original literature.

Pay attention to the following when collecting data:

(1) Use predecessors in methods or improve them on the basis of predecessors;

(2) Support this viewpoint in theory;

(3) The conclusions of previous studies are different from those described in their own articles and need to be explained;

(4) The problems studied in this paper are controversial and under discussion.

Step 2 Prepare research materials

① Selection and arrangement of materials;

② Analysis and processing of experimental observation data; ③ Reasonable selection of appropriate drawings, forms and photos.

3. Refine ideas, clarify results and draw conclusions. According to the data obtained from relevant literature and experimental observation, the ideas contained in the experimental design are re-examined and analyzed from the viewpoint of dialectical materialism.

(1) Which viewpoints are established in theory and confirmed in experiments;

(2) What viewpoints have not been confirmed in the experiment and need to be revised;

(3) This phenomenon and indicators are beyond the original idea, and may have new inspiration.