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The Steps of a Migration Project 
A migration entails some mandatory steps and some that are optional. Furthermore, whether a step is applicable depends on the initial situation and the desired target scenario.
The step sequence can be divided roughly into two main parts:
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1. Preparing Migration
Preparation of migration should be guided by two objectives: to do everything necessary to ensure that the scope of the migration is kept to a minimum and to provide answers to as many questions as possible regarding data origin and procedure and that could arise during the actual migration. The preparation steps are optional and only influence the effort required for the migration and its duration. Although you might in some cases change or supplement data during these steps, you do not perform the migration itself.
2. Performing the Migration Project
When you actually perform the migration, you work through a series of steps that follow a logical sequence. For this reason, some of the steps are mandatory in every case.
