Why Startups Fail: An Analysis of Post-Mortems
foundersblock.com
foundersblock.com
That's interesting because I think that is a psychological problem more than anything else.
Getting your product or service in front of a 3rd party (not your mother or buddy) is scary for many people...myself included!
Starting at the left of the image, you will see what is most likely to kill your startup. Go to each item in turn, and check to see if you are handling the situation correctly. If you get yourself a clean bill of health then your startup is "Prime" and likely to succeed.
If you run afoul of one or more of these items, then you need to work on some things...
I don't really want to talk in depth about how many items I feel I need to work on, but it makes me think about factorials instead of primes.