Jason at 37signals has started a discussion about feature prioritization with his recent post. He describes the epicenter of software as the most important, must-have feature. He argues that this feature should always be the one that is built first, since without it you don’t have an application. This is the same approach we reccommended in our recent post about prioritizing requirements with Kano analysis. The epicenter, while critically important, isn’t sufficient to drive success for the software.