➀ The German Association of Engineers (VDI) celebrates the 140th anniversary of its first guideline; ➁ The VDI guidelines have become an indispensable tool for engineers since the publication of the 'Principles and Instructions for Investigations on Steam Boilers and Steam Engines' in 1884; ➂ Today, the VDI's rulebook includes over 2,200 guidelines, ensuring standardized processes, safety standards, and technical recommendations.