"MacNamara's Curse" refers to the phenomenon where a focus on measurable outcomes can lead to unintended negative consequences. Named after Robert McNamara, a former U.S. Secretary of Defense, it highlights how an overemphasis on quantifiable metrics can distort decision-making and overlook important qualitative factors. This concept is often illustrated in contexts like military strategy or business management, where leaders may prioritize data-driven results. As a result, they might ignore critical elements such as morale or creativity, ultimately undermining the very goals they aim to achieve.