The Cybersecurity and Infrastructure Security Agency (CISA) leads the nation’s effort to understand, manage, and reduce cybersecurity risk, including by supporting Federal Civilian Executive Branch agencies in evolving and operationalizing cybersecurity programs and capabilities. CISA’s Zero Trust Maturity Model (ZTMM) provides an approach to achieve continued modernization efforts related to zero trust within a rapidly evolving environment and technology landscape. This ZTMM is one of many paths that an organization can take in designing and implementing their transition plan to zero trust architectures in accordance with Executive Order (EO) 14028 “Improving the Nation’s Cybersecurity” § (3)(b)(ii),1 which requires that agencies develop a plan to implement a Zero Trust Architecture (ZTA). While the ZTMM is specifically tailored for federal agencies as required by EO 14028, all organizations should review and consider adoption of the approaches outlined in this document.