Not
or not
This is often tied in with "whether" and, more often than not [to discuss later], it is unnecessary.
First up we look at:
In this second edition of Wine and Conversation, linguist Adrienne Lehrer explores whether or not wine drinkers (both novices and experts) can in fact ...
source see my page
This is better:
In this second edition of Wine and Conversation, linguist Adrienne Lehrer explores whether wine drinkers (both novices and experts) can in fact understand wine words in the same way. Her conclusion, based on experimental results, is no.
See also http://semanticcuisine.yolasite.com/semantic-cuisine.php
To be continued.