With the increasing internationalization of business activities, the posting of employees abroad is becoming an integral part of human resources management. At the same time, the employment of foreign workers is becoming increasingly important for internationally operating companies. This work systematically and clearly addresses the regulations that apply to international assignments in labor law, social security law, and tax law. Numerous examples, checklists, and contract templates help the user navigate this complex area, which is subject to many interdependencies. NEW in the 5th edition: The new edition brings the previous edition from 2011 up to date. It addresses all issues related to temporary assignments of employees and the employment of foreign workers, taking into account current case law and the latest legal requirements from EU law as well as international agreements. Additionally, complex legal questions regarding modern work structures are also addressed.