6.2 Demonstrate knowledge of search logic, search engines and features of the Internet

Table of Contents

1. Introduction
   1. Boolean logic
   2. The Boolean operators
   3. Logic diagrams: the AND operator
   4. Logic Diagrams: the OR operator
   5. Logic Diagrams: the NOT operator
   6. Using multiple Boolean operators
   7. Constructing precise Boolean searches
   8. Search engine assumptions
   9. Advanced search facility
   10. Advanced searching on Yahoo
   11. Other points on Boolean searching ...
2. Truncation and wildcards
3. Grammar of the Internet
4. Search engine operation
5. Ownership of the web
6. Dark internet and the invisible web

Logic diagrams: the AND operator

Imagine that we have a number of websites which give information about children's clothes. Some of these have information only on girls' clothes, some have information only on boys' clothes and some have information on both boys' and girls' clothes. In the diagrams the left hand circle represents all records including the word girls and the right hand circle represents all the records including the word boys

AND

girls AND boys

The shaded area represents the records which have information on both girls' clothing and boys' clothing.

Let's have a look at Logic diagram for the OR operator ...