In the service sector, internationalization has gained significance over the past few decades. Several drivers can be identified for this trend. The implementation involves a complex planning process that requires consideration and coordination of multiple, often interdependent aspects to be successful in expanding business abroad. This necessitates an intensive engagement with the relevant market entry and market development forms. The focus is on so-called knowledge-intensive professional services, which are increasingly offered internationally. Taking into account eclectic theory and empirical research findings, this work argues for suitable market entry forms while considering service-specific characteristics, requirements, and common strategic goals. Practical examples complement the investigation. The book is recommended for decision-makers in the service sector and economists who wish to delve deeper into issues of internationalization in the service industry.