The three documents mainly include: review, thematic review, annual summary of disciplines, progress report, data manual, progressive publications, literature guide and so on. Third-level literature, also known as third-level literature, is a literature compiled from a large number of related documents through comprehensive analysis and research, usually around a certain theme.
Collect a large number of related documents through secondary literature retrieval, and deeply process their contents. Dissertations, scientific reports and patent documents belong to first-class documents, and most periodical papers and conference papers belong to first-class documents. Contents, titles, abstracts and indexes belong to secondary literature.
Monographs, reviews, encyclopedias, standard documents and product samples belong to three kinds of documents. The comprehensive articles in periodical papers and conference papers belong to three times. A small part of the paper is a comprehensive paper, which also belongs to three documents.
Three documents refer to the products of comprehensive summary after extensive and in-depth analysis and research on relevant first-level documents and second-level documents. People usually refer to this kind of literature as the results of "information research", including reviews, thematic reviews, annual summaries of disciplines, progress reports, data manuals, progressive publications and literature guides.
Characteristics of the three documents
Synthesis: The third-level information is comprehensively analyzed based on a large number of related documents. Synthesis means that a large number of scattered information, facts and data about a specific topic are synthesized, evaluated and screened, and briefly described in concise words, with very general contents.
Targeted: The third kind of information is compiled for a specific purpose by collecting a large number of relevant documents, analyzing and synthesizing them. Therefore, it has a strong pertinence, that is, aiming at the information needs of specific users and serving specific purposes.
Scientific: The third information is a summary of specific professional topics on the basis of existing knowledge. So its viewpoint is mature, its content is reliable, it has materials, facts, data, suggestions and conclusions, and it is highly scientific. It can generally provide direct reference, reference and use, so it is generally valued by researchers and managers.