A paperless post-Brexit migration system could prove problematic for employers who have become accustomed to working with hard copy documents. A report, The progress of the UKs negotiations on EU withdrawal: the rights of UK and EU citizens, noted that documents traditionally requested as part of citizenship checks, such as passports and biometric cards, were understood by employers and the proposed digital-only settled status systems success depended on businesses embracing a new way of working. The Home Office has proposed making the settled status process as paperless as possible, issuing applicants with digital codes. Employers can enter codes into the Home Office website to confirm an applicants immigration status. Yet, opponents say some officers are mainly paper based and that issue could be made worse if the Home Office opted for a predominately app-based system.