Answer: Division of labour
Explanation: Division of labour entails dividing various tasks of making a good amongst the workers in a system. This organizing system is normally used when there is a large work force. The reason why this system is used is because it allows workers to focus on the specific process they are tasked with, allowing them to perform this task more effectively and efficiently, as long as there is mass production of the specific good. This also allows workers to specialize in their specific task, because they have gotten used to executing it.
Because an assembly line apporach is used in Alistair Fashions, the existence of mass production is likely. Each worker, or group of workers, are tasked with specific tasks such as cutting fabric, finishing sleeves, making collars, etc, allowing them to focus on the element they are tasked with and perform their tasks efficiently.