Primary industry involves getting raw materials e.g. mining, farming and fishing. Secondary industry involves manufacturing e.g. making cars and steel. Tertiary industries provide a service e.g. teaching and nursing. Industrial Systems Factories have inputs, processes and outputs. Inputs can be the raw materials need to make something.
Inputs can also be labour, buildings, capital and machinery.
Processes are the things which go on within the factory. This is usually the manufacturing of goods. It can also be design and research - anything needed to make something. Outputs are the things which leave the factory. This can include the finished product, profit or even waste.