The core activity of YELL AG is management reinforcement for companies, particularly SMEs, through the provision of management services such as: Interim Management, Business Consulting, Leadership Tools, Human Resource Management, Business Coaching, Business Controlling, and Project Management. The company offers specialized services for various areas, including corporate management, finance and controlling, human resource management, and leadership tools. It supports companies in addressing challenges such as market changes, crisis management, restructuring, and succession planning.