Enterprise architecture (EA) is the most important thing to review in this situation, as it provides a holistic view of the current and desired state of the IT applications, data, and infrastructure, as well as the business processes, capabilities, and goals that they support. EA can help identify the redundant IT applications, the data sources and dependencies, the integration requirements and challenges, and the alignment with the strategic initiative of providing integrated services to customers. EA can also help define the roadmap, standards, and governance for achieving the desired state of IT integration.
IT risk register, balanced scorecard measures, and IT strategic plan are also important things to review, but they are not as essential as EA in this situation. IT risk register is a document that records the IT risks that may affect the enterprise's objectives and operations, as well as their likelihood, impact, mitigation strategies, and status. IT risk register can help identify and manage the potential risks associated with IT integration, such as data quality, security, compatibility, performance, and compliance issues. Balanced scorecard measures are a set of metrics that track the performance of IT in relation to the enterprise's vision, strategy, and goals.
Balanced scorecard measures can help evaluate the effectiveness and efficiency of IT integration, as well as its contribution to customer satisfaction, business value, and innovation. IT strategic plan is a document that outlines the vision, mission, objectives, initiatives, and actions of IT to support the enterprise's strategy and goals. IT strategic plan can help align IT integration with the business needs and expectations, as well as allocate the necessary resources and budget for it.
References := Enterprise Architecture Governance - CIO Wiki; Enterprise Architecture Governance | The Definitive Guide | LeanIX; Enterprise Architecture Governance - Why It Is Important (Part 2); What is IT governance? A formal way to align IT & business strategy.

The first course of action when the use of new technology in an enterprise will require specific expertise and updated system development processes is to assess the gap between current and required staff competencies.
This course of action involves identifying the skills, knowledge, and abilities that are needed to implement and manage the new technology, and comparing them with the existing capabilities of the IT staff. By assessing the gap between current and required staff competencies, the enterprise can determine the extent and nature of the sourcing challenge, and plan for appropriate solutions, such as training, hiring, or outsourcing. According to one source1, "A competency gap analysis is a process of identifying the difference between what is required for a person to perform their role effectively and what they actually possess." The other options are not the first course of action when the use of new technology in an enterprise will require specific expertise and updated system development processes, but rather some of the steps or outcomes that can follow or result from the gap assessment. Performing a risk assessment on potential outsourcing is a step that involves evaluating the benefits and drawbacks of delegating some or all of the IT functions related to the new technology to an external service provider. This step can be done after assessing the gap between current and required staff competencies, and identifying outsourcing as a viable option. Updating the enterprise architecture (EA) with the new technology is a step that involves incorporating the new technology into the holistic view of the enterprise's IT environment, including its goals, principles, standards, policies, processes, technologies, and systems. This step can be done after assessing the gap between current and required staff competencies, and ensuring that the new technology aligns with the enterprise's strategic objectives and business requirements.
Reviewing the IT balanced scorecard for sourcing opportunities is an outcome that involves measuring and reporting on the performance and value of IT sourcing activities and outcomes. This outcome can be done after assessing the gap between current and required staff competencies, and implementing the chosen sourcing solution. References := What is Competency Gap Analysis? Definition & Examples

A program roadmap is a strategic plan that outlines the vision, objectives, scope, deliverables, milestones, dependencies, risks, and benefits of a large-scale IT program. A program roadmap can help the CIO and other stakeholders to communicate, align, and monitor the progress and outcomes of the program. A program roadmap is essential for a complex and long-term IT program such as centralizing the core business processes of global entities into one core system. A program roadmap can help to ensure that the program is aligned with the IT strategy and the business goals, that the program has a clear and realistic scope and schedule, that the program has adequate resources and governance, and that the program delivers the expected value and benefits1234. References: How to Create an IT Strategy Roadmap. Definitive Guide to Developing an IT Strategy and Roadmap. What is an IT Roadmap?. How To Develop a Strategy Roadmap in Six Steps.