Industrial and manufacturing engineering is the study and application of process development and improvement through the use of analysis and engineering methodologies. In a manufacturing environment there are two main types of production systems; the traditional, and the lean system. The traditional model relies on large inventories of finished goods and expected customer demand for products. The lean methodology is just the opposite, products are produced based on customer orders, i.e. a product would only be made after someone orders it, creating very little inventory quantities. Students in this lesson will learn about push and pull manufacturing through airplane manufacturing.