This document presents a decision-making model (DMM) intended to assist those dealing with matters of national security. The DMM considers possibility, capability, preferability, and credibility when evaluating decisions. It notes that one should calculate the probability of possible events, develop capabilities to deny opponents' desires, weigh doability alongside one's own preferences, and have political will and alternative plans to give decisions credibility. The model is informed by quotes about the importance of considering war, politics, and negotiations when making impactful decisions.