Does your product/service solve a customer need?
Have you solved a customer problem that is scalable? How do you know?
What are your prospective customers currently doing to solve that problem? What will switching cost for them?
Do you clearly understand the needs of everyone involved in the purchase journey (procurement, distribution, retail, end purchaser, end user)?
Continually optimise your sales process
Sam Gribben, Melodics & Serato