In Phase C, what is the primary focus when an existing application is being replaced?

In Phase C of the TOGAF ADM, which pertains to the Information System Architectures, the primary focus when replacing an existing application is indeed on data migration requirements. This is crucial because when an existing application is replaced, it often involves transferring a significant amount of data from the old system to the new one. Understanding the data that needs to be migrated—its structure, quality, and volume—ensures that the new application operates effectively and meets the needs of the organization.

Data migration requirements encompass assessing data compatibility, ensuring data integrity during the migration process, and determining how to handle legacy data. This focus ensures a seamless transition and minimizes the risk of data loss or corruption, which can have serious implications for ongoing business operations.

While alignments of architecture, impacts on other projects, and interoperability are all relevant concerns in the broader context of application replacement, they do not take precedence over understanding the specific data migration requirements critical for a successful transition.