Data conversion is the process of transforming data from one format or system to another. It is a critical activity in any data migration or integration project, as it affects the quality, accuracy, and usability of the data.
Therefore, IT governance should mandate that data conversion has documented approvals from business process data owners, who are the stakeholders responsible for defining and maintaining the data requirements, standards, and quality for their respective business processes. This ensures that the data conversion meets the business needs and expectations, as well as complies with the relevant policies and regulations. References:
CGEIT Review Manual 2021, Chapter 4: Resource Optimization, Section 4.2: Data Management, page
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CGEIT Review Questions, Answers & Explanations Manual 2021, Question 10, page 252 Data Conversion: Definition, Best Practices, and Examples3 Data Governance Roles and Responsibilities4

Standardization is the best option to lower costs and improve scalability from an IT enterprise architecture perspective, because it reduces complexity, increases interoperability, and enables reuse of IT resources. Reference:= ISACA, CGEIT Review Manual, 27th Edition, 2019, page 79.