From the Point of View of Psychology, Sale Is a Customer Conviction System in the Advantages Provided to the Case of Acquiring Thir Production. And in the Case of the Buyer Aware of these Advantages, He Makes a Purchase. HENCE The Priority Task of the Seller is to shower the value of the Goods or Service He has acquied. It is Necessary to try to transform Technical factors Into Advantages for the Client. Yes, this is not a Task of Simple. However, if he learns to do this, then you will open horizons of prophetble sales.