Ask HN: What are the dimensions you base your product decisions on?

You are a builder, you are dying to build that nice and shiny new idea of yours. How do you evaluate them and manage your backlog of ideas/features/bugfixes? - Impact - Cost - Usability - Scalability - PR value - Simplicity - Instant revenue - Long term revenue - Production quality - Virality - Engagement - Stickiness - Team votes - User stories - Someone's opinion on Twitter - Appstore ratings - Following VCs' hot-trends - Solving your own pain - Any other or combination of some

Please share your experiences and big wins/mistakes Thanks everyone!