1, common law
It is a method of literature retrieval by using literature catalogue, abstract, index and other retrieval tools. The key to using this method is to be familiar with the nature, characteristics and retrieval process of various retrieval tools and search from different angles. Common law can be divided into sequential inspection method and backward inspection method.
2, backtracking method
This is a method of continuously tracking and searching the references attached to the existing literature. In the case of no retrieval tools or incomplete retrieval tools, this method can obtain highly targeted information with high precision and low recall rate.
3. Segmentation method
It is a combination of retrospective method and common law, and the two methods are used alternately in stages and segments until the required information is found.
Extended data
Information retrieval originated from the reference service and abstract index of the library. It first developed in the second half of19th century, and by the 1940s, indexing and retrieval had become an independent tool and user service project of libraries.
With the advent of the first electronic computer in the world in 1946, computer technology gradually entered the field of information retrieval, and was closely combined with information retrieval theory. Off-line batch information retrieval system and online real-time information retrieval system have been successfully developed and commercialized.
From 1960s to 1980s, with the promotion of information processing technology, communication technology, computer and database technology, information retrieval developed rapidly in the fields of education, military and commerce, and was widely used. Dialog international online information retrieval system is the representative of information retrieval field in this period, and it is still one of the most famous systems in the world.