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Simplified Technical English

Standard for Technical Documentation
European Union Trade Mark No. 017966390

ASD-STE100 Simplified Technical English
Issue 9 - January 15, 2025

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The official page of the ASD Simplified Technical English Maintenance Group (STEMG)

ASD-STE100 Simplified Technical English (STE for short) is a controlled natural language and an international standard to write technical documentation. It is fully owned by ASD, Aerospace, Security and Defence Industries Association of Europe, Brussels, Belgium. 

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Historical overview

STE was developed in the late 1970s by the European Association of Aerospace Industries (AECMA, now ASD), with support from the Aerospace Industries Association of America (AIA), upon request from the  European airlines (formerly, AEA). The goal was to make aircraft maintenance documentation easier to understand for readers with only a basic command of English. The resulting AECMA Simplified English Guide was released in 1986. In 2005, it became an international specification, and in 2025 it became an international standard: ASD-STE100 Simplified Technical English.

STE today

Aerospace and defense

Still at the core of technical documentation 

Industry and services

Used in a wide range of sectors, including language services 

Academia

Adopted by universities and researchers worldwide

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