Under Push model, products are manufactured or procured based on anticipated customer orders (speculative). This model is also known as Built to Inventory or Built to Sock. The name itself reveals its functionality. Products are manufactured in anticipation of customer needs. There are no prizes for identifying industries that use push model, it is obvious that retail heavily uses push model. Even though direct to store or cross docks are implemented, overall retail supply chain is based on push model. Some of the big names in the retail industry are trying to adopt the hybrid model which is a combination of pull and push. Some of the key challenges and characteristics could include: