As far as Dell is conceived, the direct selling models to adhere to five principles, these five principles are in fact Dell's requirements to the supply chain.
One is to find the shortest path available to users. In other words, direct demand produced by the users of DELL. This shortest way is the best way to direct marketing. Clerect marketing can meet the needs of the clients directly, so the most direct knowledge of the market, the most direct understanding of consumer demands.
Second is standardized. DELL chose to enter the industries which are generally with high technical standardization. For example, PC, and the printer. If you want to promote a non-standard products in a regulated markets, it consumptions a great deal of work, so the standardization is very important.