Debt collection management is becoming increasingly important for companies today. Collection agencies play a significant role in the German economic system. Every company faces the question of how to collect its receivables when a customer does not pay an invoice. Hiring a collection agency is one possible option. The questions regarding the background, both legal and economic, of collection agencies and their hiring, as well as the recoverability of the collection costs incurred, are the central themes of this book. This study presents collection agencies from various perspectives and comprehensively covers the key aspects of the collection industry in Germany and individual collection agencies. This includes the classification of collection agencies within debt collection management.