Collect the specific Migration Requirements And Constraints from the available Requirements Catalogue and validate them. Consider, using the knowledge of the business domain and of the specific environment, what additional Migration Requirements And Constraints would apply and add them to the list. Take care that each migration requirement and constraint has a clear definition. Validate the quality of the new migration requirements against the same criteria that were used for validating the as-is requirements (described in: 3.1.2). Align with relevant business stakeholders in order to find missing migration requirements.