Imagine that you have designed a brand new phone, and you’ve created a few copies to help introduce it. It is a hit, and the world demands more! Now, you’ve got to build a factory to produce it. What requirements would your assembly line have to meet? The factory would have to use interchangeable parts for the product. Each worker would have all the parts he or she needs when he or she needs them. Timing would be coordinated so that every team finishes their task and moves at the same time. The factory would use a conveyor belt to bring the work to the workers, instead of having the workers move around looking for the work. Precautions would be made to ensure that workers have a safe place to work.