- there is some problem to be solved - I must understand how people solve the problem (apart from specially designated software) - I must understand what's wr

- there is some problem to be solved - I must understand how people solve the problem (apart from specially designated software) - I must understand what's wrong with all existing solutions - I must be personally interested in solving that problem even if it does not bring millions - I must have at least remote knowledge of how to implement that idea (technically, I mean). I'm reluctant to rely solely on others. - etc. See the YC application form, it has very good questions.