- Tractability: How difficult will it be to launch a worthwhile version 1.0?
- Obviousness: Is it clear why people should use it?
- Deepness: How much value can you ultimately deliver?
- Wideness: How many people may ultimately use it?
- Discoverability: How will people learn about your product?
- Monetizability: How hard will it be to extract the money?
- Personally Compelling: Do you really want it to exist in the world?
Might come handy (I plan to check my latest ideas against these points).