The document discusses developing and maintaining competency models through an ontology-driven approach. It proposes a reference model using a competency catalog and ontology to connect strategic and operational HR processes. A three-layer reference process is described to avoid outdated models through continuous improvement involving top management, middle management, and employees. A pilot study collecting 600 competencies from a hospital showed challenges around separate operational and strategic tasks as well as reducing modeling efforts. The approach aims to increase semantic coherence among HR systems and provide enhanced learning support services.