Documents can be roughly divided into primary documents, secondary documents, tertiary documents and tertiary documents according to the processing level.
1. Primary documentation: This is the most basic form of documentation, usually including books, journal articles, research reports, conference papers, etc. These documents usually contain the latest developments in the research field and the most original research materials.
2. Secondary documents: These documents are the organization and summary of primary documents, such as abstracts, abstracts, catalogs, etc. They can help readers quickly understand the main research results and progress in a certain field.
3. Tertiary literature: This is the literature produced after comprehensive analysis, evaluation and interpretation of primary and secondary literature, such as reviews, special reviews, etc. They provide a more comprehensive and in-depth perspective, which can help readers understand and grasp the overall research picture of a field.
4. Quaternary literature: This is produced by further processing of tertiary literature, such as manuals, guides, encyclopedias, etc. They provide more comprehensive and systematic information and can help readers gain an in-depth understanding of the basic knowledge and research methods in a field.
Basic steps for literature:
1. Search for literature: First, according to the research questions and goals, determine the type and scope of the literature to be searched, such as journal articles, dissertations, and conference papers. wait. Then use libraries, academic search engines and other channels to search.
2. Screening of literature: After obtaining a large amount of literature, it is necessary to screen. The screening criteria include the relevance, reliability, scientific nature of the literature, etc.
3. Read and analyze literature: After selecting highly relevant literature, read and analyze it carefully. When reading, pay attention to the main content, research methods, research conclusions and other key information of the literature. During analysis, the viewpoints and research methods of different literatures should be compared, and the literatures should also be evaluated.
4. Organize the literature: After the reading and analysis are completed, classify the literature according to different themes or types to facilitate subsequent review or further analysis.
5. Write a literature review: Summarize the above process and write a literature review. The content of the literature review includes: research questions and background, relevant research status, research methods, research results, etc.