This article is pretty touchy feely to really make serious business decisions on. Here is my list (not just for tech startups):
Is your business or product in a under-served niche (ie not a sexy industry that everyone is trying to get a piece of)?
Do you have deep understanding of the industry or do you have a close relationship to someone that does?
Is the idea easy to execute on (ie can you see clearly how to serve the market and all existing technology exists and is proven)?
Is the market big enough so that you think you can easily sell 1000 units per month at $10 per unit, 10 units per month at $1000 or equivalent in billed hours of service?
Can the business be revenue positive in 6-months?
Can the business be automated or are profits recurring (ie could the business be successful with minimal human resourced or still be successful with minimal oversight by the founders)?
Are there any barriers to entry for your market or possible intellectual property opportunities?
Can you start the business without substantial upfront capital outlays (ie no inventory, etc)?
Can the business stand on its own (ie doesn't need a huge existing customer base, mailing list, big advertising outlays, or additional features to make it an full product)?
Do you have any other secret sauce not covered in the above?<p>No need to answer yes to all of them, but having 5 to 6 of these things in spades would be my criteria for doing more exploration.