1. starting from the external requirements. To start this way, we will have to find the requirements of the people around them. For us, this may be a demand for goods that are used in everyday life already exists.
1. Starting from external demand. To start, we must demand of the people around us, this requirement may be a demand for products that are used in everyday life anyway.
1. Starting from the external demand. The start that we must demand of the people around us by the needs this may desire goods are used in everyday life.