Introductory Paragraphs Techniques

http://elc.polyu.edu.hk/cill/eap/essayintrotype.htm

The four basic techniques that are covered in this site are anecdote,Impact statement,General statement and Rhetorical question.They are used in difference use.

Anecdote is used a short story to let the reader know more about the topic.
Impact statement is used to give impaction to the reader and attract them to read .
General statement is used to give a general picture of the article to reader.
Rhetorical question asked a question to attract the reader to read the article to find the aswer.

I think this four techniques is very useful in written introduction.They are mainly used to attract the reader to continuous read the article.I think rhetorical question is more useful than others.Because this techniques can attract the reader to read through the article.