5.1 Using appropriate search engines and interrogating subject/discipline-specific databases
The fact that a large amount of information is likely to already exist online means it can be easily searched. On the negative side, the sheer volume of information you might retrieve means it can be difficult to sort through this effectively. This is where search engines (and specialised search engines in particular) can help filter resources, when used correctly. When doing this, it is important to bear in mind that a fully comprehensive search might require the use of more than one type of search engine or database to ensure the full range of data in the deep web can be searched.