In my opinion there is no right answer for this question, since it is a question that every entrepreneur face some day and only a few get a succesfull answer for it.

However, I am going to mention what for me are the key points for a succesfull business plan.  First of all, the business plan should be as accurate as possible, so that means been objective and brief at the same time without lacking the important details. Another relevant aspect to take care of is the research. Nowadays we have unlimited access to information, thats why plans with a good research are going to differ from the others. Another issue that entrepreneurs have to focus is the presentation of the plan, referring to comprehension, organization, well written and attractive. This is because a business plan is the way to convince or involve investors, bankers, customers or suppliers that your business it is better that the other competitor´s.

To conclude, this is not a magic formula, but at least I belive these are the factors a succesful business plan needs to have.