What are the common ways of information retrieval?

1, along the check method

To retrieve the starting age of the subject as a starting point, according to the chronological order of the search from far and near, until the literature to meet the requirements of information. The advantage of this method is to check the high rate, the disadvantage is time-consuming, laborious.

2, retrospective method

The use of existing literature behind the references, from near and far to find the method of retrospective. The advantages of this method is intuitive, convenient, continuous tracing can be found in a large number of references to a particular topic, which is in the absence of search tools or search tools are not all the case of expanding the source of a good method, the disadvantage is that the search efficiency is low, low rate of checking the whole rate of omission of a high rate of detection.

3, the synthesis method

Also known as the circular method, segmentation method or alternate method, is commonly used method and the synthesis of the two methods of retrospective method. That is, the use of search tools and the use of literature after the references for the traceability of the two methods used alternately, know to meet, it can get a higher rate of search and search accuracy.

4, inverse search method

A reverse time from near to far to find the literature method. This method is mostly used for new topics or old topics with new content, the need for recently published literature, in order to grasp the recent period of time the level of the subject reached and research trends. Therefore, the search can be discontinued once the required literature information is available. The advantage of this method is to save time, and the disadvantage is the high rate of leakage.

5, sampling method

For the characteristics of the development of the research topic, to seize the rapid development of the discipline, the publication of a period of more literature, a method of searching year by year. The advantage of this method is that it can be less search time to obtain more literature information, the disadvantage is that the use of this method must be familiar with the characteristics of the development of the discipline as a prerequisite, otherwise it is difficult to achieve the desired results.