Michael Porter first introduced the concept of value chain in his book “Competitive Advantage” . Most organizations have numerous activities along the supply chain into the process of converting raw materials to products or services .
These can be classified either as primary or support activities that all business must undertake. The idea of the value chain is that how activities are organized and carried out determines a firm’s cost and thus its margin. each link of the chain must communicate to other department clearly and promptly. For example marketing and sales must communicate accurate sales forecasts and pass them on the enough time for procurement to buy the correct type and quantity of raw materials who in turn must coordinate with inbound logistics so they can organize receipt of goods.