Why has the Personal Software Process not been widely adopted by software industry?

Personal software process is basically refers to the intellectually tough and demanding for a degree of commitment (for example: Prolonged and high priced training needed) which are not usually feasible to attain.

In additional to the requiring stage of various dimension is culturally tough for various software program practitioners. As, it is not much feasible approach so the personal software processing is not much widely adopted by the various software industries.