"In the European Union, migration is one of the foundations of shared prosperity, unity and diversity. Perhaps unsurprisingly, then, the phenomenon of migration to and within Europe calls for regulation. This book is about the role the law plays in facilitating migrants' integration and effective participation in the EU, whether coming to the EU for the first time or moving within the Single Market. Specifically, this book addresses the experience of one category of migrants accessing work in the Single Market, namely, third- country nationals. While third- country nationals play an important role in the EU by and through their work, they habitually experience inadequate skills' or qualification recognition and wrongful discrimination in accessing work, thereby inhibiting their well- being. This book proposes to describe and critically analyse the legal and policy architecture governing such migrants' access to work, equal treatment and non- discrimination and the recognition of their professional qualifications - in other words, some of the most important aspects of the regulation of migrants' integration in Europe. This book, in essence, is a study of the role that the regulation of skills' or qualification recognition plays in facilitating migrants' integration in Europe.