Big amount of information is available in textual form in databases or online sources, and for many enterprise functions (marketing, maintenance, finance, etc.) represents a huge opportunity to improve their business knowledge.

Sentiment analysis or opinion mining refers to the application of language processing to identify and extract subjective information in source materials. Generally speaking, sentiment analysis aims to determine the attitude of a speaker or a writer with respect to some topic or the overall contextual polarity of a document.

Facing this new domain I have make a personal research, and realize a synthesis, which has help me to clarify some ideas. The below presentation do not intent to be exhaustive on the subject, but could perhaps bring you some useful insights.

http://www.decideo.fr/bruley/docs/2___sentiment_a_v0.ppt