This document discusses reasons for startup failure from both practical and theoretical perspectives. The practical analysis examines over 300 startup failure case studies and identifies common reasons including poor timing, incomplete or unskilled teams, flawed business models, lack of funding, and inability to achieve product-market fit or effective marketing. The theoretical section will review literature on topics such as the exploration-exploitation dilemma, statistical explanations, conflicts between VCs and CEOs, and the effect of top management team size on conflict.