N the age of consumerism, the consumer awareness has increased role to play. The ideal will be a win-win situation among buyer and seller, but as it always happens, every one leans for win-lose situation. Perhaps that is the human tendency. 
to classify, the objectives can be classified as.. 
1. information-product, market, price etc... 
2. alternatives- a fair comparison if any 
3. application- knowledge about usage of high tech products. 
4. legal provisions- if applicable 
5. aesthetics - 
6. connect producer-buyer 
7. feed-back