No Plan Survives First Contact With Customers
steveblank.com
steveblank.com
I tend to agree with the author: a business plan is worse than useless if your goal is to follow it blindly; the value comes from the process of planning, and any document produced needs to be viewed as provisional and open to revision.
Once I realized my assumptions about our target audience were as unproven as the "model consumer" in economic theories, I know that can't be right.
I never considered trying to list what I don't know... Sounds like a useful exercise! Should be very enlightening about pointing me at what I should be trying to learn.
Now if I only I could do something about what I don't know that I don't know.
Here is one of the key elements stated "testing your assumptions". Often all the valuable time spend on business plans has limited value if the assumptions are wrong.