What problem or need will your product or service fulfill and how is this better than what’s currently on offer?
How big is the potential market? What’s the potential “open goal”?
Do you have the right team? Is it well balanced with a decent mix of experience and raw enthusiasm?
How will you dominate your market? e.g. by having proprietary protected know-how that creates a barrier to entry for competitors or can you (quietly) build dominance in a small niche market then blast off from there?