1. Is there a market 2. Do I need to teach people that this is important...or do I get to exploit existing demand? 3. Is there some sort of barrier to entry?

1. Is there a market 2. Do I need to teach people that this is important...or do I get to exploit existing demand? 3. Is there some sort of barrier to entry? 4. How long will it take to build a minimum viable product? 5. What the competitors are like, their current reputation, their current SEO rankings, their current adwords campaigns etc. 6. Then I usually build a quick fake page to see if there is any demand. I'd rather piss off 200-300 people and see what the actual demand is like, instead of relying on them to tell me what they think they want. 7. If everything works out, I get to work. If not, I get to save 3 months chasing an idea that has no potential.