The key to being a savvy online searcher is to use common search techniques that you can apply to almost any database, including article databases, online catalogs and even commercial search engines. This is important because searching library databases is a bit different from searching Google.
The use of AND
AND is used to tell the database that you want to retrieve documents or items which contain both (or all) of the keywords you specify. It is used to connect unrelated terms or concepts. A search using AND with these keywords would look like this: Aspergers and Education
The use of OR
OR is used to communicate to the database that you want to retrieve documents which contain one, or the other, or all of the terms that you specify. It is used to connect related or synonymous terms and is a very powerful tool in keyword searching. OR allows you to ask the database to retrieve all these variants. For example, an OR search: Pervasive Developmental Disorders or Autism Spectrum Disorders
The use of NOT
NOT is used to communicate to the database that you do not want the items it retrieves to contain certain terms that you specify; that is, it excludes results. Such as Autism not Aspergers. This will give you search results about autism but not aspergers.
Truncation
This is a technique that broadens your search to include various word endings and spellings.
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A database of in-depth, authoritative reports on a full range of political and social-policy issues extending back to 1923. Each report is footnoted and includes an overview, background section, chronology, bibliography and debate-style pro-con feature, plus tools to study the evolution of the topic over time.