Apart from litmus test, do due diligence: > Who else claims to solve the same problem? Examine them. > How do those people who are unaware of specific solutio

Apart from litmus test, do due diligence: > Who else claims to solve the same problem? Examine them. > How do those people who are unaware of specific solutions to the problem solve it? > In theory is it easier to implement your solution, or to upgrade an existing solution? > What are related problems? > What's your user acquisition plan? (TechCrunch is not) > Talk about your idea, both other developers and normal people.