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The process is called 123-MVP and we’ve used it with all the startups we worked with through Altar.io and 10kstartup. It’s a simple but extremely effective methodology. It intends to help you decide: If you should or not build your startup; and if yes, which features should be inside the MVP (Minimum Viable Product) The process in 3 steps must be an SSCC Elevator Pitch: Simple Stupid, Crystal Clear, Simple Stupid.