The application conversion phase begins immediately after the assessment phase. All components can be re-named for use in the new target environment. The new applications will be generated in their new languages, and will execute against the new relational database structures.

The application software conversion and the database and data conversion phases take place concurrently. It is recommended that the database administration teams be involved in the Database and Data Conversion thread, and that the application teams be involved in the Application Conversion thread.

This conversion phase includes application pre-conversion setup, application conversion and iterations, and testing support at several levels. The primary deliverables are those that comprise the converted application software.