Practical Data Migration
Since its first publication in 2006, Practical Data Migration has become the only industry-wide data migration methodology certified for organisations, practitioners and vendors. Authored by Johny Morris, who continues to work on the project front line. He is constantly updating his practice to align with new technological, and commercial developments. PDMv3, published in 2020, is the latest edition and includes updates on agile, cloud, SaaS, and commercial relationships.
https://www.practicaldatamigration.org has been a supporter and organiser of the Data Migration Matters event since its inception as a space where enterprise application migration can be promoted as a technical domain in its own right.