The marketing plan that has a feedback cycle, from 8th stage back to the 4th. That is because sometimes during the planning process, we might need to perform stages 4 to 8 several times before the final plan can be written.
What was the outcome? As much as 90% businesses started by entrepreneurs and small business went busted or failed within a year. I experienced one of the many busts few years ago (with my cafe business) because i don't really have a proper and "the few solid sheets" called a marketing plan.