The shift from promise-based to evidence-based security reflects a significant change in how organizations approach cybersecurity. Traditionally, companies relied on vendors' promises to stop breaches. However, as threats have grown in complexity, mature security professionals now understand that no vendor can prevent all attacks. Evidence-based security emphasizes transparency, control, and accountability, where security teams build and maintain their defenses based on observable, testable, and measurable data rather than just trusting vendor assurances. In this approach, security is seen as a continuous process, where teams can create, test, and apply their own detection and prevention logic tailored to their unique environment. This ensures that security measures are not only effective but also transparent and adaptable to the organization's specific needs. While prevention remains important, evidence-based security ensures that all preventative actions are backed by clear, understandable data, allowing security teams to make informed decisions and maintain control over their security posture. Enables security leaders to shift the narrative from actions-based to outcomes-based: instead of saying “We’ve spent 60 hours and implemented tool X”, they can now say “We’ve invested $3,000 and that allowed us to build security coverage against 13 more ATT&CK TTTs”. Ref: [[MITRE Attack Frameworks]]