Each time an aircraft is made, it is the result of assembling a multitude of parts representing a very large volume of orders. And what is true for the aircraft assembly line is true for the whole aerospace industry, where not only aircraft but also helicopters and satellites are built. Parts for manufacturing come from multiple suppliers from all over the world. Most of them are quite complex and need to fulfill the highest quality standards. Each time, a delay can result in very high costs. It is essential that all suppliers involved in the manufacture of an aircraft have real-time visibility of demand and inventory to adapt to fluctuations and changes in customer requirements. As a result, it is also essential for customers and suppliers to have a common tool that enables them to better collaborate and gain visibility over demand as well as inventory (see Fig. 3.1).