Launch... Get feedbacks... Iterate... Launch again... This is a never ending process for a startup with VC-backed. But, if your company is not VC-backed, then,

Launch... Get feedbacks... Iterate... Launch again... This is a never ending process for a startup with VC-backed. But, if your company is not VC-backed, then, you have to use this method: Lauch... Get feedbacks... Iterate.. Bootstrap... Launch again... Get more feedbacks... Iterate more... Bootstrap more... Another never ending process until you are successful... Think of NeXT and Pixar..