The most appropriate first step for the Chief Governance Officer (CGO) is to conduct a formal assessment of the proposed change. Before modifying a long-standing governance framework, it is crucial to understand the full implications. This impact assessment will evaluate the potential benefits, such as increased business agility and reduced administrative overhead, against the potential risks, such as architectural misalignment or increased security vulnerabilities from a less rigorous review. This data-driven approach provides a sound basis for decision-making, ensures the change aligns with enterprise objectives and risk appetite, and demonstrates a structured, responsible response to the business units' concerns.

A. Create a central repository for the business to submit requests. This addresses the mechanics of submitting requests but fails to address the substance of the current, escalated issue, which is the lack of response to a specific process improvement.
B. Explain the importance of the IT governance framework. This is a defensive action that dismisses the valid business concern about inefficiency. Effective governance requires listening to and addressing stakeholder needs, not justifying the status quo.
D. Assign a project team to implement necessary changes. This action is premature. A project team cannot be tasked with implementation until the scope, risks, and benefits of the change have been assessed and a decision has been made.

1. ISACA, CGEIT Review Manual, 8th Edition (2020). Domain 1, Task Statement 1.5, "Ensure that the GEIT framework is periodically reviewed, updated, and relevant," emphasizes the need to evaluate proposed changes based on shifts in business needs. The first step in this evaluation is to understand the impact of any potential update to the framework.

2. ISACA, COBIT 2019 Framework: Introduction and Methodology (2018). Section 4.2, "Goals Cascade," explains how stakeholder needs must be translated into enterprise goals. The business unit's request is a stakeholder need, and before acting, governance must assess how a change would impact the achievement of enterprise goals.

3. ISACA, COBIT 2019 Framework: Governance and Management Objectives (2018). The governance objective EDM01, "Ensured Governance Framework Setting and Maintenance," includes the practice EDM01.03, "Monitor the system of internal control." This involves evaluating the effectiveness and efficiency of controls, which is precisely what the business units are questioning. Assessing their proposal is a key part of this monitoring and maintenance activity.