Some entrepreneurs, do modify there business plans on regular intervals . Some do not . There is an essential disadvantage of not modifying the business plan on regular intervals . One of them, is related to the validity of assumptions made in the plan . The Business plan need to be updated with the changing market scenario . Otherwise , it becomes a part of history .
Infact,I feel Business planning is a process . Once a person starts religiously following the process , he creates clarity in lot of avenues of Business . That clarity helps him to structure the plan in a better fashion , which could lead to better revenue outcome.