Historical overview of the development of the National Classification
- Historical overview of the development of the National Classification of Activities (NKD) 1994 - 2001
- Historical overview of the development of the National Classification of Activities (NKD) 2002 - 2007
- Historical overview of the development of the National Classification of Activities (NKD) 2008 - 2024
- Historical overview of the development of the National Classification of Activities (NKD), from 2025 onwards