The concept of productivity - dual-purpose and multi-purpose

We heard about "killing two birds with one stone" and in Chinese, there is a similar saying, "One action, two outcomes".

This is nothing but the basic concept of productivity. To improve productivity at work or at home, we have to constantly think of how to increase the output while maintaining the same amount of input, or maintaining the same output while reducing the input.

This concept of productivity or better usage of resources has led to the development of machines, equipment, buildings, facilities and products that serve dual-purpose or even multi-purpose. Look around our office or home, it is not difficult to find items that are dual-purpose or multi-purpose in function.