Tertiary information refers to the information generated by searching and using primary information and other materials (such as research reports, reviews and comments) according to the clues provided by secondary information.
Third-level literature, also known as third-level literature, is a literature compiled from a large number of related documents after comprehensive analysis and research. Usually, it is formed by collecting a large number of relevant documents around a certain topic through secondary literature retrieval and deeply processing its contents. It is a document that comments, summarizes and predicts the development trend of existing achievements, including review, summary, progress and dynamics. In literature research, we can make full use of this kind of literature to understand the research history, development trend and level of the research topic in a short time, so as to grasp the technical background of the topic more accurately.
Experts can provide a series of guiding opinions on a particular topic. These opinions are all information, not the original state, but they are all information with quality assurance and thematic characteristics. Although the guidance provided by an expert has a source, he may not be able to provide an accurate source, because the information has gone through a lot of processing and transformation from generation to provision through him. The literature expression of tertiary information is tertiary literature. The three typical documents are manuals, guidebooks, dictionaries, yearbooks and other special data sets.