Enterprise architecture (EA) is the best option to support the planning of IT investments required for the enterprise, because EA is a practice and a discipline that describes and documents the current and future state of the enterprise's business processes, applications, data, infrastructure, and security, and how they align with the enterprise's vision, mission, goals, and objectives. EA can help the enterprise to plan IT investments by providing a holistic view of the enterprise's IT architecture, identifying the gaps, needs, and opportunities for improvement, innovation, or transformation, and prioritizing and selecting the IT projects, programs, and portfolios that deliver the most value to the stakeholders and customers.According to ISACA's CGEIT Domain 2: IT Resources1, ''EA is a key enabler for IT investment planning and decision making.EA helps to ensure that IT investments are aligned with business strategy and support business outcomes.'' Furthermore, according to ISACA's article on EA2, ''EA can help to optimize IT spending by reducing complexity, duplication, and waste, and by increasing efficiency, agility, and interoperability.'' Therefore, EA is the best way to support the planning of IT investments required for the enterprise.