Which is the key factor to drive success of new product with network effects,product quality or installed base? The answer of this problem extremely influence what strategy the company will adopt.

The studies show that large developing countries have advantages of backwardness in the establishment process of technical standards,and the domestic markets of large developing countries provide breakthrough point for the standards establishment and sufficient installed base for subsequent spread.

This paper describes the current state and trend of external inspection technology of printed circuit board and mounting substrate.