This is long term planning . any business and enterprise needs to do that for its survival and growth. Any company for that matter plans its policy according to a decided mission and vision.
The owners of bharti enterprises , mittals were not in telecom sector in 70s and 80s . And remember it was also not the time as the sector was controlled by the govt. in the 90s as the Government decided to open up telecom equipment manufacturing to private sector bharti saw a big opportunity in the sector.
Therefore environment plays a very decisive role in shaping up the vision and mission of any business firm. as the business firm donot operate in isolation and depend on the both internal and external environment for survival and growth the question for you is
that Either vision and mission decides the company external and internal environment or the company decides its vision and mission after studying external environment.
and what is this external environment