Smallest Viable Audience
That’s one reason why it’s so important to identify your smallest viable audience. The smallest group of customers that will enable you to thrive. By seeing them, obsessing about them and serving them, you can refine your product at the very same time that you establish the conditions for growth.
...it could be that your success at serving this small but viable audience gives you the team, the cash flow and most of all, the social proof to begin to find a different set of customers. Customers that might want a different set of benefits, a different story, a different way to change.
From Customer Development