A search engine is a searchable database of Internet files collected by a computer program (called a crawler, robot, worm, spider). Indexing is created from the collected files, e.g., title, full text, size, URL, etc. There is no selection criteria for the collection of files, though evaluation can be applied to ranking schemes that return the results of a query.
What is a subject directory?
A subject directory is a service that offers a collection of links to Internet resources submitted by site creators or evaluators and organized into subject categories. Directory services use selection criteria for choosing links to include, though the selectivity varies among services. Most directories are searchable.
Large amount of material
Databases are updated at a variable rate
Emphasis quantity over quality
Subjects & links meet each other very well
Quality over quantity
Usually maintained by editors (e.g. Yahoo!, BUBL, INFOMINE, LookSmart, dmoz)
A subject gateway in the context of network-based resource access, can be defined as some facility that allows easier access to network-based resources in a defined subject area. The simplest types of subject gateways are sets of Web pages containing lists of links to resources.
Subject gateways are also known as subject-based information gateways (SBIGs), subject-based gateways, subject index gateways, virtual libraries, clearing houses, subject trees, pathfinders and other variations thereof.
Also known as Web portals
Effective Online search strategies
“ American English” or ( American English )
machin ? for machine, machinery, machinist
industr y industr ies industr ial industr ialization
If you want both
Wom a n
Wom e n
Wom * n
If you want to search for
language literacy acquisition
language vocabulary acquisition
language lexical acquisition
language phonologically acquisition etc. simultaneously;
Language * acquisition
title, author, subject, keyword, all fields, etc.
language, date, region, file format
Boolean searching “ phonetics” OR “phonology” “ phonetics” AND “phonology” “ phonetics” NOT “phonology”
To find FEWER results,
Search in specific fields (title, abstract, subject, keywords, etc.)
Add or change search limits (date, language, etc.)
Add more search terms (using AND)
Use phrase searching instead of AND
Use specific subject headings instead of common language words
Decrease search terms connected with OR
To find MORE results,
Use truncation or wildcard characters (* or ?)
Include more synonyms (using OR)
Search “all fields” rather than in specific fields
Remove search limits (e.g. date, language, etc.)
Use AND instead of phrase searching
Use broader subject headings
If you received no results at all DON’T WORRY!
Focus the search to all fields
Add parenthesis (“ “)to Boolean search
Check all the wildcards and operators used in search are correct for the database (help files)