Forbes has a good article on The 10 Questions You Should Never Stop Asking . http://www.forbes.com/2009/11/20/ten-key-questions-entrepreneurs-management-k...

* What is our purpose for existing?

* Who is our target customer?

* Why does anyone need what we're selling?

* If there is a need, is it enough to support a profitable business?

Seems like basic stuff, but a good reality check.