I continue to see intelligent people pander the fallacious correlation between entrepreneurship and failure. The implication is that new ventures are intrinsically risk magnets and, with exceptions, almost guarantees high levels of failure. Yes, many fail. And many of the many I observe have had flawed planning models that were unrealistic and unproductive by design. I would argue that this is at the root of causes for struggle and failure.
Without a viable model to work from, founders flounder having only their own native intelligence and the force of personality to guide them. Some are lucky enough to have effective mentors. At the end of the day, more will succeed with good planning models.