1. Primary documents
It is documents produced directly by people based on their own practical experience in production, scientific research, social activities, etc. It is also often called original documents (or original documents). First-class literature), the knowledge and information recorded in it are relatively new, specific and detailed.
Primary documents are the documents with the largest quantity, the most variety, the most fresh content, the most widely used, and the greatest influence in the entire literature, such as journal articles, patent documents, scientific and technological reports, conference proceedings, and degrees. Papers, etc. These documents have obvious characteristics such as innovation, practicality and academic nature, and are the main basis for comparative analysis of documents in scientific and technological novelty searches.
2. Secondary literature
Secondary literature is also called secondary literature. It organizes, condenses, and refines a large number of scattered, scattered, and disordered primary documents, and organizes them according to the A certain logical sequence and scientific system should be arranged and stored to make it systematic for easy retrieval and utilization.
The main types include, directory, index, etc., such as "Chinese Science and Technology Data Catalog", "Chinese Science and Technology Periodicals Database", etc. Secondary literature has obvious collection, systematization and searchability. It collects not the primary literature itself, but the clues of primary literature in a specific scope. Its importance lies in greatly reducing the time spent searching for primary documents. Secondary documents are the main tool used to retrieve documents in novelty searches.
3. Tertiary literature
Tertiary literature, also called tertiary literature, is a document compiled by selecting a large number of relevant documents through synthesis, analysis, and research. It is usually based on a certain topic, using secondary literature retrieval to collect a large number of relevant documents, and deeply processing the content.
This type of literature includes reviews, comments, reviews, progress, trends, etc. These documents that comment on, review existing results, and predict their development trends have high practical value.
In the novelty search work, you can make full use of review documents that reflect the research trends in a certain field, and understand its research history, development trends, levels, etc. in a short period of time, so that you can more accurately grasp the research to be investigated. Technical background of the project, grasp the new points.
4. Relationship
From primary documents, secondary documents to tertiary documents, it is a transformation of knowledge and information from dispersion to concentration, from disorder to order, and from extensive to refined. Carry out different levels of processing. The quality and quantity of the information they contain are different, and their role in improving people's knowledge structure is also different.
Primary literature is the most basic information source and the main object of literature information retrieval and utilization; secondary literature is the centralized refinement and ordering of primary literature, and it is a tool for literature information retrieval;
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Tertiary literature is the result of comprehensive analysis and processing of scattered zero-time literature, primary literature, and secondary literature according to topics or knowledge categories. It is highly condensed literature information. It is both a document information retrieval and The object of use can also be used as a tool for retrieving literature information.
Extended information:
Primary documents have the following characteristics:
First, the content is original and is the author’s own work experience, observation or actual research results; The content of this document is advanced and novel, reflecting the latest research results in relevant fields.
The second is that the description of the document content is specific and detailed, and it is suitable for research
The third is that the number of documents at one time is huge and scattered in various journals, media, conference proceedings, books, and continuous publications. Among the objects and special documents, it is difficult to find.
Baidu Encyclopedia - a primary document?