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To know whether you have enough information sources about your topic, you need to choose the most appropriate search tool depending on the nature of information need.
Below are examples of search tools and their descriptions.
You can access these search tools anywhere, anytime.
Online catalog
An online catalog consisting of a collection of bibliographic records. It is use to find resources within the DLSU Libraries.
Subscription databases
Specialized databases subscribed by the Libraries containing vast amount of information (in full-text) not available on Google® or other common search engines. Access to these databases is made available in and off-campus 24/7.
Discovery service
A resource discovery tool that aggregates almost all of DLSU library resources. It is accessible in and off campus.
EBSCO Integrated Search(EHIS)
A federated-search engine that allows users to simultaneously search subscription databases.
Subject directories
Allow browsing Internet resources by different subject categories, e.g. INFOMINE,Yahoo! Directory,EncyclopediaBritannica. Subject directories may return results that are high quality and high relevance. They do not store databases of websites, but merely point to them.
Search engines
Like Google & Yahoo! offer keyword searching to large databases of web documents. Some smarter search engines use technologies to offer “link relevance,” or PageRank, group results into subject hierarchies or concept clusters or “autocategorize,” & use a thesaurus to “disambiguate” terms with multiple meanings.
You may use search engines, when you
Have a narrow topic or several keywords.
Want to do a comprehensive search.
Want to retrieve a large number of documents on your topic.
Want to search for particular types of documents, file.
Invisible or deep web
Publicly accessible information available via the World Wide Web but not retrievable using search engines that rely on crawlers or spiders.